Why is my ex acting weird by stalking me, restricting me, and avoiding eye contact?

My ex just walked past me, and I just noticed a shadow behind me. Then he walks right beside me, and my dog noticed him and he walks towards him and he notices and stares at him, then I see him and suddenly he panics and go backs and pretends he's on his phone just next to me. Then he walks really fast and I keep looking at him, and he looks down and tries to avoid eye contact.

Then he tried to follow me and unfollow me but just enough so I noticed, then he put me on restrict on phone and WhatsApp? I mean what the hell what does this mean and what is he trying to do?

Why is my ex acting weird by stalking me, restricting me, and avoiding eye contact?
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