Hey I saw this movie before. Steve start a relationship with a girl based only in physic attraction, the girl is the kind shy and intellectual lolita so they start with flowers, candy, lots of action and that kawai stuff the girls like.
After the hormones slow down they realize they have nothing in common and I mean nothing at all. She is into books, literature, science, study and he is... well he is Steve.
At the end they broke after an awkward period of "So... how is it going?" and we came back to the melancholic/drunk Steve. Mmm where I saw this movie before?