How to stop obsessing about a cheating ex?

Anonymous
She was my first in everything. I was completely smitten. We were together during our teenage years, for about 3.5 years. Eventually, she broke up with me. I learned after the breakup that she was cheating on me while we were together.

I had a major depression after that. She never apologized to me (nor recognized it despite the fact that I had proof). In retrospect, she was a teenager (so was I) and at this you're not mature enough.

Regardless, I cut her off from my life (it's been many years now) and started working on myself. Whilst I cannot say that I am very happy with everything, I can at least say that I'm doing much better than I was after the breakup. Having low self esteem, after the breakup, I became suicidal as I made the mistake of thinking it was my fault that she cheated on me. It was a long journey, one that probably isn't finished, but I made good progress.

Anyways, in a moment of weakness, I decided I would go check her social media. She's getting married. She has an incredible job, good pay and her future husband is a "handsome" doctor.

I am jealous of the fact that, in the end, she gets the 'HAPPY ENDING" after what happened. I do not believe she's a serial cheater and that she will cheat on him as well. In fact, over the years, I have come to realize that the reason she denied ever cheating (so hard in fact) was because she was ashamed of it (probably a defense mechanism of hers). I believe she learned her lesson and that she won't cheat on him.

This whole situation just keeps obsessing me to the point where it makes me anxious. It keeps coming back again and again in my thoughts and I have a hard time just letting go. What can I do?
How to stop obsessing about a cheating ex?
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