2. He gets a girlfriend--something that most people on the spectrum can't do--and then it's established that he never slept with her all the time he managed to keep up a relationship with her. Not even once. What a loser.
I saw this movie quite a long time ago. I think my memory serves correctly that he and his girlfriend seemed perfectly happy with their relationship as it was (ie sexless). I was happy for them. If they were happy then that's all that matters. Neither was a "loser" and both were free to have a relationship the way that they wanted to.
What I recall happening, unless I'm thinking of a different movie, is that the guy's NT brother told him that he should kiss his girlfriend because that's what people do. From what I recall it didn't seem like he wanted to kiss his girlfriend but after the goading of his NT brother, he did. And...they broke up. Guess what? His girlfriend didn't want to kiss either. Neither of them did. Both of them were perfectly happy as it was. The brother pushing him to kiss her is what broke them up. Could it be argued that the brother was a "loser" for meddling in their relationship that they were happy with as is?