Has anyone purposely ruined someone else's relationship?

Anonymous
When in an unrequited love situation and you're aware of unsavory information about your love interest (who doesn't love you in return) have you gone to their love interest and relayed the information you know - knowing very well that doing so will mostly destroy what they may have?

Yes, I know it's spiteful, and vindictive. I've personally done it twice in the past and regretted it afterward. That's why I've learned not to do it again. But in my current situation, I have to admit, it is STILL very tempting.

In fact, I need to exile this individual from my life completely and despite my attempts I haven't been able to do so successfully. I have pulled away a great deal, but cutting off ALL communication is excruciating. But then again, so is maintaining any form of contact. I'm damned if I do, and I'm damned if I don't.

The thing that keeps me only mildly sane is reviewing what I've learned about this person. Essentially, the individual is a master manipulator... a con artist almost. He knows exactly what to say & when to say it to fulfill his agenda. He played me for months, and he's also currently playing his young girlfriend - for different reasons of course. I would love nothing more at this point than to see that relationship disappear and have very incriminating information I could tell her that would serve that purpose. But I keep reminding myself to take the higher road. However, the longer my pain goes on, the weaker my resolve gets. Plus, when I consider my weakness in cutting him out of my life. He has informed me that if I did contact her, then he would exile me from his life. My thought is, "Great, if I can't cut you out of mine, then you cutting me out of yours will effectively do the same thing." Yes, I know! What a chicken sh*t thing to do. I'm fairly strong willed about many things, but when it comes to leaving a man that I love completely, I've got no spine.

What should I do? How do I get through this with some self-respect in tack? I'm sure there are people out there who have stooped to this level. Anyone care to share their stories?
Has anyone purposely ruined someone else's relationship?
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