Why is my ex situationship copying our plans with someone new?

I had a recent situationship we were planning on going on holidays and doing other stuff it ended and we don’t talk anymore , he always tries to interact with my friends and stares at me. I miss him but he has a new situationship and I heard they are going to the location we planned on going to and doing the plans we thought of I find that weird. Maybe they are going maybe not it’s the fact he is telling everyone is weird and hurtful too
Why is my ex situationship copying our plans with someone new?
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