Why my ex stopped contact me after he knew I'm happy with my current relationship?

I didn't knew I was his mistress until I found out about he has a girlfriend. and I had to ended this relationship. I was hurt knowing that. long short story, he kept trying to reach me out even though he knew I have someone else until I told him that I'm happy with my current relationship.

actually I was more happy when we were together. since he stopped contact me, I feel sad.. I miss being around him.

Why my ex stopped contact me after he knew I'm happy with my current relationship?
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