My ex followed me on Instagram?

We broke up two months ago but continued to try and work it out until a month ago. He broke up with me and regretted it almost instantly and spent a month trying to get me back, but he wasn't being the guy I remembered and he was inconsistent, I couldn't trust him any more. I rejected him multiple times. I still really liked him I just needed to see the guy I first fell for. He hurt me and in response I posted a picture with another guy, he's just a friend, it wasn't suggestive. And my ex shouted at me and blocked me from everything. A month later I notice he's now unblocked me and started following me again. What could a reason for this be?
My ex followed me on Instagram?
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