Jonas and Eva had a rocky start and their relationship began by Jonas cheating on Ingrid. They were together throughout most of Season 1, from before Summer 2015 untill Christmas 2015. Eva cheated on him by hooking up with Chris because she thought he cheated on her. Jonas hid that he hung out with Ingrid's brother to get weed, leaving Eva to assume he was with Ingrid behind her back. Jonas told Eva to find her own identity, and shortly after they broke up.
They remained amicable, Jonas even shows Eva the nudes girls have sent him on Snapchat. They hang out with Noora in 2x01 and she finds them remaining friends odd. In early Season 2 Eva appeared jealous of his new relationship with Isabell. They talk several times later on that season, especially in relation to the Yakuza fight. In Season 3 they appear friendly but they aren't close, and Eva is mainly seen hooking up with Penetrator Chris. Throughout Season 4 they don't appear to interact much. Jonas dated Emma and Eva had a thing with Chris. In Season 4, Episode 10 it is revealed they hooked up for the first time since their break-up. At the Eid-party they hookup up again, and are assumed to have gotten back together forever.
In Season 2, Episode 1 when Noora comes to Eva's, Jonas and Eva are watching netflix together. The three of them are talking until Jonas receive a message from a girl Jonas is interest in. At first Noora seems to be surprise that Eva is helping Jonas to be with an other girl and she ask her how she feels about that, Eva explain to Noora that her and Jonas are friends so it's not a problem. Then Jonas receive a pic of the girl topless and him and Eva joke around in front of a Noora who is more than confused by what she sees.
The next day at the lunch, the girl are eating together, when Vilde proposed the girl to have a reunion on friday Eva refused saying that she have to be at a parties at Elvebakken with Jonas and that she promised him that she will come. The girls all smile at her, which make Eva laugh and she said to them that they are only friend and she found that it's stupid that people think that it's not possible to be friend with your ex. She states that when your in a relationship it's like being with your best friend plus having sex and that her and Jonas ended the ex part but it doesn't mean that they can't be friend anymore while the girl are still smiling at her not believing what she saying.
On friday night, the girl are at Noora's. When Vilde ask to Eva if tonight she will slep with Jonas, Eva say no and they only friend, Vilde ask her if they had slept together since they broke up, Eva respond to her that the last time they had slept together was the day they broke up and that it was the best she ever had. After that Eva is trying to call Jonas multiple time but he doesn't answer the call and Eva looks sad and angry that Jonas doesn't answer her call.
They don't interact a lot and it seems like they moved on from their relationship, but it's assume that they are on friendly term.. Eva is seen to hookup with Penetrator Chris mutiple time and even thought Jonas is not seen to have anyone, he talks about hooking up with the boys.
In Season 4, Episode 1 when Vilde say that Mahdi or Jonas could be a good match for Noora, Eva is immediatly against that idea.
In Season 4, Episode 8 Jonas is attending Eva's birthday party even though they don't interact directly,when they all sing happy birthday to Eva, Jonas is just next to Eva, and both seems to enjoy the time they spend all together.
On the thursday of theSeason 4, Episode 9 Jonas and Eva hookup for the first time since their break up.
In Season 4, Episode 10 Jonas recieve a text from Chris asking advice to get together with Eva, but Jonas seems jealous and think that Eva deserve better than him. After the boys saying to him that he maybe change and that he should give him advice, he ended up sending him that they should watch fresh prince and eat nachos.
the next days when Emma come to the girls and mention that Jonas invited her to come with him at the Eid-party Eva looks surprised and confused but respond to her question until she leave.
At the Eid-party we see at first that both of them are hanging out with their dates, until that Chris goes to the table and see Emma and both of them instanely get on together, from afar Eva looks confuse until Jonas come next to her, both of them began to laugh at the situation before Jonas notice that Eva have sauce left on her cheeck, he whip it off, when their are about to kiss Vilde interrupt them.
During Jonas's narration when see them kissing.
They broke up in december of 2015 and got back together on June 2017.
During an interview Marlon Langeland (Jonas) at "Skam"-stjernene møter folket; he was asked who he would see Jonas with by the end of the summer and he respond "i have to say Eva [ You root for Eva? ] I root for them , it's the golden couple and has been since the first episode [ So it's Eva and Jonas forever? Even in 5 years? ] Yes".
In an interview the creator, screenwriter, director and the showrunner Julie Andem reveals that it was Marlon who asked for Jonas and Eva to end up together.
In a interview actress Iman Meskini (Sana) said that in 10 years she imagine that Jonas and Eva would still be together and that they would have a child.
They share the first and last kiss on-screen of the show.
They are the only main couple who got together before the show begin.