What does he think of me, really? Please help before someone's heart breaks?

You should let itt be. You told him what you had bottled up and unless he breaks up with his girlfriend then you guys should talk like that. Remember how you would feel if u were in his gf shoes. Remeber karma always comes back so tell him to let it go and if he is ready for something serious to stop hurting his current gf feelings and let her go.