Why would my ex do this?

today my ex was driving by me and my new guy and he drove pretty slow when he saw us but i acted like I did not see him and he stopped his car after a while and stared at me... Walked out his car and just stared at us😅 like... He was behind us i just looked with the edge of my eyes to see if he is still there😅 If he has moved on like he says he would he want sex and then do this?

Why would my ex do this?
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