From how you describe what your ex did to you, it sounds like she acted like she took pleasure in hurting you.

I think for me, I impulsively fell 'in love' too fast, seeing the best of that person and not allowing myself to see the bad signs (or telling myself that I could deal with it) but then as time went on, I fell just as quickly out of love as I fell in.

I got turned off sexually, and just couldn't have sex with them anymore.

I only did cheat once in my life, and I regret it. I had a serious college boyfriend. I got to that point just as I described above. At that time we both had a friend who was an incredibly sexy punk rock star guy (I was weak in the knees with lust). One day he said to me that my boyfriend and I are perfect for each other because we are the same size. This was pretty insulting because I am only 5'5" and weighed 100 pounds.

I ended up having a one-night stand with him. Somehow his triggering my insecurity caused me to do that!

I told my boyfriend that it happened and I was so sorry. But, I also told him that I needed to break up and move home. I was cracked up over school and everything.

He smacked me across the face and that was the end of that.

Read about Borderline Personality Disorder. You may see more traits of your ex in there.