Why did my ex boyfriend unfollow me?

Anonymous
My ex followed me about two months ago (on his finsta) and I followed him back. He never liked any of my pictures but would always see my Instagram stories and I don't really post much. We broke up almost two years ago, and it was pretty messy. I don't have on anything else other than Facebook. Anyways, he unfollowed and I was curious as to why he would follow me and then unfollow me.
Updates
+1 y
So my friend told me he has a girlfriend and she actually felt uncomfortable with him following me, so that answers my question. Thanks for the answers (most of you guys were right).
Why did my ex boyfriend unfollow me?
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