Why would he do this?

I just found out my ex has purchased football season tickets for him and his new wife at my alma mater? I live and die for my college even though I know longer live in that state. He does NOT live in that state either. He never even went to an event there until we dated. He is very involved in the college he attended so not sure why I have to now run into him at these events. He knows I Will be there. I have had season tickets for over ten years and took him there several times. We are both in our 40's and went through a bad breakup when I took a consulting job out of state. He went right back to his ex and married her. So why can't he stay out of my life?
Why would he do this?
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