Easy.

She's too good for you. Maybe in looks, maybe in stature at school, maybe in brains. Who knows?

The point is: your subconscious mind already knew that, so you tried to be as nice as possible so that you wouldn't lose her, but by being so nice, you gave her the impression that that's all you are. Again, subconsciously, girls want a guy who is sensitive but will still be able to protect them or play his masculine role (which not allot of guys do these days because it seems that 95% of guys today are more feminine than the girls that drool over them). Anyway, you can either cut your loss and go find some hoodrat to bone for a week or two, or you can try being a semi-asshole. No, that's not being a douche-bag to her. It's being strong and hard.

This might be confusing to you, but it's right.

Also, if it IS confusing to you, I can blame myself because I'm too lazy to read it over and fix spelling / grammatical errors.