Why would a guy who dislikes me watch me talk to other people and eavesdrop on my conversations?

I don’t think I ever did anything to offend him so I can’t explain where his disdain for me comes from. Everyone I know describes him as a laid back friendly and talkative guy but to me he is very reserved. However when he sees me talk to other people he tries to get my attention and act civil with me. A few times I caught him eavesdropping on my conversations. Why is he doing this?

Why would a guy who dislikes me watch me talk to other people and eavesdrop on my conversations?
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