I think they will. In the time they knew each other they have been an incredible impact on each other.
Finn is also the kind of person that it's impossible to be mad at. He's 15 and has no dad to teach him about the world he is entering. It's understandable that he's a bit of a screw up.
At present, they both have one thousand different hormones running through their blood and screwing up their minds. And neither have someone to explain what they are feeling.
indeed they both need to grow up, but whats out there to bring them together again. as far as we know, they no longer even talk to each other as stated by doctor princess. what can fix everything that has happened.