This is an internship and obviously not for a doctorate, so they're early twenties, likely 22 at most. There's a reason that auto insurance companies charge males MUCH higher rates until they are 25. It's one thing to say 'they should be mature and Cooper should stay with the girl despite being gay and not interested in her romantically, and Andy should totally ignore the attraction he's had since they were young kids and stay with the conflict of interest he's currently engaged in with the guy who's too big to fit,' but in a semi-realistic story, twists, turns, and other things happen, and different people will fel differently about it. If a relationship is ownership, notice is required, or anything like that, they will be upset. This doesn't solve all the problems either. At least, based on how the story is so far, the loose ends are definitely a thing, hiding in the background and waiting to pounce. So for all that people can say 'What a dick move! This shouldn't happen!', it's one of those things that in reality DOES happen, and happened here in this story, and has a good chance of having repercussions, which makes the story interesting. Could they have split to different sides of the country and been only memories? Yep. Cooper could've ended up in a loveless relationship with Chelsea, who really doesn't deserve such a thing.
