What's worse?
1) Girl that says "don't you dare fall in love with me, I'm only using you" to guy, falls in love with guy, proceeds to have a temper tantrum when guy doesn't fall in love with her.
2) Guy that is told "don't you dare fall in love with me, I'm only using you" and comes to the conclusion that he can treat her like garbage.
If the author's intent was crafting the most insufferable characters of all time then bravo, masterful work.