You really no idea how damaging what you are doing is to yourself....these vampires are not referred to as that because they are cute little puppy dogs....best case scenario, she f*cks u like a little ho and you start "developing feelings again"...then a few months go by and U are in the same spot you were in, and she still feels no guilt whatsoever. Bro I've been exactly - EXACTLY where you are and wanted my revenge too, banged the girl for quite a while, dropped her at Christmas after making her feel that I forgave her for cheating on me uptine who the f*ck knows how many times....but it didn't help me to move on at all....I'm didn't start seeing any improvement in my life until I stopped seeing the girl period. It certainly messed with my phsychi more then it did hers. You can't move forward until you separate yourself from that sh*t...U just can't, and I WAS spinning plates.
The problem boils down to the fact that she isn't consciously aware or in control of what she is doing, and by you knowing and STILL doing what you are doing, U are now the one being a d*ck...Not a man moving on and into his own...Not doing something to be proud of. You also forget how convincing these girls are, you are playing with fire and are gonna get F*CKIN BURNED!