He avoids me but looks at me whenever I’m not looking? Why?

We had a falling out recently and he ended up blocking me and made some hurtful comments about me. Whatever. I apologized to him for my behavior during our short affair and he apologized to me for his behavior. Haven’t spoken to him since and I WILL not until he first initiate the conversation.

He goes out of his way to purposely avoid me. Goes in a different direction all together to not see me or will avoid eye contact with me. Will also go in another direction after passing me to just avoid me and if he sees me in that direction he’ll absolutely avoid it on purpose.

I’ve been told recently that whenever I’m not looking he’ll look at me. Watch me walk into the room, look at me as I walk by, etc. I’ve also caught it on numerous occasions from the corner or my eye). They aren’t dirty looks. Just emotionless looks.

Note: He has a weird obsession with one of my guy best friends who is my co worker. (Only friendly interactions) that I’ve been in conversations with him and my co worker has told me he’s told me he’s watched the guy watch, nosiness, listen in on our conversation, and look at us. (This isn’t the first time he’s done it)
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By avoiding eye contact I mean up close eye contact as he’s passing me or walking by IF he absolutely has to. Basically he’ll look at me before he actually has to pass me.

Also: he always takes a glance at whoever I’m talking to whenever he’s near and I’m in a conversation with somebody and we’re being obnoxious or just having friendly fun together.
He avoids me but looks at me whenever I’m not looking? Why?
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