I TOTALLY understand the need to "blow up bridges" in order to move forward....I like to refer to it as nuclear bombing them, as it goes waaaay beyond "burning bridges". Its the need to completely destroy any possible links in order to be able to move forward. And in all honesty, sometimes you do need to do something completely out of character, something that isn't exactly nice....in order to completely sever ties and move forward. I did it recently myself, and while I'm not proud of my actions, the end justifies the means.

Don't judge yourself based on one action. Relationships of any kind can be VERY hard to let go of....in your case you kept going back again, and again, and again. (I was the same in my situation.) Simply trying to separate yourself from the situation wasn't enough, it could never be enough, and that's why you resorted to more extreme means.

Am I saying this is a good thing to do over and over again? Nope, not in the least. I've only done it once in my life so far, and its served as a huge learning lesson to me. I am hoping that the next time I can remove myself from the situation a lot sooner and don't become so hooked on going back again and again and again.

And I hate to put it in a tit-for-tat sort of way, but c'mon, if that guy wasn't such a d-bag to you, would you have resorted to snitching on him to his ex? I sort of doubt it! This guy lied to you, cheated on you, GAVE YOU AN STD (uhm, worst case scenario it could have been one of the ones that renders you sterile, gives you cancer in a few years, or even kills you, right?) So you finally snap and give him what's coming to him. Honestly, I think he got off lightly!