Why does my ex still follow me on Instagram? I unfollowed him?

Anonymous
We aren’t full exes... we had something that had to end because of where he’s at in his life (he’s 30 and doesn’t have a job but is looking and may move far away so we ended it). But i was really upset when it ended and voiced it to him and was kinda a bitch. I unfollowed him on Instagram. That was a week ago. He still follows me. I’ve posted like 4 times since then so he sees me, he knows he still follows me... if it’s over wouldn't he unfollow me?
Why does my ex still follow me on Instagram? I unfollowed him?
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