Hm, it's a bit of a troublesome situation. It's not the usual dense protagonist syndrome, it's just that he doesn't even consider that someone might like him. It's obvious to outside observers, but almost impossible when you're in it yourself. It's a recipe for hurting others, because even if you don't think you're anything special, that's only what you believe. You might lead someone on without even realizing it.
I'm just saying, for those with low self-esteem and self-loathing, just be aware. Consider all angles, even those you believe impossible: that you have good points that are attractive to others.