So I've got this friend

So I've got this friend:

He's dating Girl #3, who he likes, but doesn't love. She is a great girlfriend to him, even though he's sort of lame. She would probably drop the L bomb if she thought it were safe, but we think she's aware of the discrepancy in their feelings. She'll do anything to make him happy.

My friend is insanely intrigued by Girl #2. They seem to be just perfect together. They were ending each other's sentences before they had been introduced. Literally. She's a little more of a partier than he is, and he doesn't fit her expectations, but he's pretty sure that they'd be a great couple if he had the ability to pursue her.

Girl #1 is the girl, maybe. Long time friends. She is impossible to deal with, and insanely irrational almost all the time. However, to quote Rilo Kiley kind of, when she's on, she's really fucking on. She'd probably be the end all, so to speak. My friend is fairly certain that she's just hanging out waiting for him, kind of like he had been doing with her for so long.

Girl #4 through 13: random repeat sightings that pique my friends' interest. Not enough information to gather a proper opinion.

Girls #14 through 3.5 billion or whatever: my friend more or less just wants to sleep with these girls

Who does he choose?