quit falling for assholes

I have a specific asshole-rebound-curse: Every time I actually fall for a guy or get really into him at all, he ALWAYS ends up going back to his ex. How much lamer can a guy make me feel than by doing that? It’s happened three (kind of 4) times in the last year and a half, and each time I feel like I’m just an unimportant little chapter in a guy’s life before he continues on with his perfect ex again … But I know it’s not a flaw of mine as much as it is my repeated mistake of falling for guys who are on the rebound. AVOID THOSE GUYS, make sure they are OVER their ex before you get attached.