Jay and Manny first started dating in We Got The Beat and broke up in Bust a Move (1) because Jay was too clingy. They got back together in Bust a Move (2) and broke up for the second time in Ladies Night after Jay stole Manny's engagement ring from a pawn shop. They started a third relationship in Degrassi Goes Hollywood and haven't broken up. Since both are off the show now, Janny is considered to be an "endgame" relationship.
In We Got The Beat, Manny hires Jay to be her date for her Philippine Debut, which she isn't too happy about, so they'll call off the party. However, her parents seem to like Jay and therefore do not call off the party. This made her want Jay to be even more repellent. They both told Manny's parents that they aren't going to college, and Manny will work as a slave to Jay. Her parents see the problem with Jay, but before her dad could complain, she told him that she was just acting.
In Owner of a Lonely Heart, Manny insists to Emma that there's nothing romantic between her and Jay. However, when a pretend date turns into a real date and a pretend kiss turns into a real kiss, Manny and Jay are both pleasantly surprised. They pretend to get engaged to spite Manny's parents.
In Bust a Move (1), Manny and Jay's faux-mance is working perfectly. But when Jay gets too serious, Manny reminds him it's all fake. She's having fun, but the engagement thing is getting old - maybe they should 'break it off' after the road trip to Smithdale College. When Manny, Jay, Ashley, Emma and Liberty are ready to go to Smithdale, Jay starts joking around about children. Manny doesn't like it and kicks him off their journey. She remembers that she doesn't have her audition tape so she asks Jay for it. Jay, since he is mad, gives her a tape entitled "Manny xxx" Manny doesn't see the title. As Jay walks away, the girls leave for Smithdale.
In Bust a Move (2), Manny discovers that her University demo reel is a sex tape that Jay made. By the time Jay catches up to her with the correct DVD, it's too late. Manny's already bombed her audition for Smithdale Drama School, so she throws their fake engagement ring on the floor and tells Jay to get out of her life for good. While everyone enjoys their road trip adventure, Jay hatches an awesome plan to get Manny into her program and to get back into her heart. In order to get Manny another audition, he pretends he is her agent and gives the judge a foot massage. After doing many other things, Jay finally gets another audition for Manny. Later, Manny aces the audition. At the Purple Dragon Concert, during the song My Window, Manny and Jay decide their engagement is real.
In Sweet Child O' Mine, Manny and Jay are doing great together, until Manny wants to meet Jay's parents. Not wanting to tell her, Jay lies to her and says they live in Malta. At the Spirit Squad dance, Manny eagerly tells him that she bought tickets to Malta, so that she could meet his parents. Jay tells her the truth, that they don't really live in Malta, and Jay is angry, because Manny bought the tickets using the money from selling her engagement ring, which belonged to Jay's late mother. Though while walking down the street, they try to call and accidentally bump into each other. Jay says how sorry he is, and tells her that he left his dad after he married his third wife and made a scene at the wedding, and never saw him again. Manny forgives him, and they leave together holding hands.
In Ladies Night, Manny has to get her pawned engagement ring back to stop Jay's pouting - it has real sentimental value for him. But she doesn't have any money, just two useless tickets to Malta. They go to an auction, but that didn't earn them enought money. Jay goes back to his "old ways" and steals the engagement ring from the pawn shop. This upsets Manny, and the two break up.
Season 8
In Lost in Love, Jay tells Spinner Mason that says a month ago Manny wouldn't return his calls but now she answers them then hangs up, and that was love at work. At the dance, Jay says he wishes Manny was at the dance so he could win her back.
InDegrassi Goes Hollywood, Manny is currently studying theater at Smithdale University. Later in the episode, Manny gets the opportunity to go to L.A for a Jason Mewes movie. When Manny auditions at Degrassi, they didn't like it too much.
Later, Manny's upset because her and Mick broke up and she didn't get a part in the movie. Emma tells her to stop moping and go to L.A, but Manny would not because Jay is driving the bus with Stüdz.
Manny hates the fact that Jay is driving the bus, but she wants to go. While on their way to L.A they stop at a club to eat. Jay and the band makes Manny sing "Crash My Party" on stage. At first, Manny didn't want to do it but out of nowhere everyone was dancing and having a good time. When they leave, they notice that the bus is missing. Manny is worried that her dream will be crushed, so she starts to walk to L.A.
After a while of walking they found that the bus broke down. Mia uses her leggings to make the bus run until they get to L.A. They then make it successfully there. Later on, Manny is seen practicing the song "Saturday Night" with Michael Ray. In the last scene, she stays in L.A with Paige, Mia, and Stüdz. When Jay is about to leave, Manny and Jay start making out, signifying that they are going out again. Jay drives off with the bus and they all wave goodbye.
In Close To Me, Jay and Manny are at the Dot with Jane and Spinner. When Jane and Manny start talking and joking around, Jay starts to joke around by telling them that they are lovey dovey and that they should kiss. Manny lightly taps Jay on the head, like a love tap. Later at Spinner's housewarming party, Manny and Jay are seen together kissing and cuddling which implies they are still in a relationship.
In Degrassi Takes Manhattan, Jay and Manny are back in town and are at the Dot, where they ask Emma to make them Spinner's self-titled sandwich, the Spin-witch. Because Emma didn't know how to use the grill, this causes the Dot to catch on fire. Later in the episode, Manny, Jay, and Emma go to "kidnap" Spinner because he is depressed and they want him to have fun. They take him to Niagra Falls, and their intentions are to get their friends Emma and Spinner together. The next morning, when Spinner and Emma are married, and when Manny and Jay ask if they can get a refund, the lady says "no". When Spinner and Emma get married, Jay is the one to marry them and Manny is the maid of honor.
Manny: "Thank you! You totally saved my ass!" Jay: "Hey I'm awesome. Your dad will never know the difference. - We Got The Beat
Jay: "Where I'm from, dates usually end with a kiss. Manny: "Where you're from, dates end from the back of a van." Jay: "Hmm touché." - Owner of a Lonely Heart.
Jay: "I'm sorry we got a little carried away, I'm just so in love with Manuella." - Owner of a Lonely Heart.
Jay: "You know how Manny used to ignore my calls? Now she answers and then hangs up! That is love in the works!"
Manny: "I'll be back before you know it." Jay: "I'll be waiting for you, boo." -Degrassi Goes Hollywood.
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