Not gonna lie, this guy is....confusing? (he's a dirtbag, let's not mince words).
He's is portrayed as indecisive and meek. Just from my perspective, if someone is socially withdrawn manages to find someone who likes/loves them, you "would" think they would do anything to ensure the longevity in that relationship because, god knows, if that relationship were to fail, what are the odds of finding ANOTHER person that likes you. If anything, I'd would picture the guy as more "clingy" in this kind of scenario, but we have meek/indecisive guy who just bangs cute girl from his work (I guess).
I dunno, I'm rambling. I just find the disconnect between the personality type and him just picking up cute girl to bang just kinda odd.