<human>: Can you summarize the given text in a few sentences?

I could really use some support. My ex boyfriend just told me all this tonight: How he was always having sex with other girls, sometimes unprotected right before he would see me, lie to me constantly, do something to make me freak out, then get mad at me for freaking out, then go do something else to piss me off.

He said he wanted me to hurt as bad as he did when I lied to him early in our relationship. It was a mistake of mine to lie, but it was regarding a friend who I have drunkingly made out with, someone who meant nothing to me. He was in my group of friends. Yes I would stop seeing him (where I would only see him in group settings anyways) if it came down to it. 

It is my fault for always going back, but he would always do something that would entice me, make me think things will change. But it was all his plan. 

I gave 110% to work things out with him. I was honest, loving, there for him consistently, while I was just used.  I feel like I wasted a whole year and maybe even lost part of myself. Well I know I lost a part of myself.

I could go on and on and on. My head hurts from crying so hard. I just can't fathom that I fell in love with someone like this. He purposefully hurt me for over a year. Who does that????
<bot>: Ex boyfriend has fulfilled his plan of revenge and told me everything tonight. sparing no details. I feel so worthless. How did I fall in love with this man?  Why was I so blind?