Why would a married man fixate on a single mother so much?

He’s married with 2 kids and I’m a single mom. He’s my neighbor and I know him and his wife probably don’t like me, that’s fine. I just want them staying out my face that’s all. He’ll do petty things like make noise while me and my baby are sleeping but when I ran into him at the park he was all smiles and trying to talk and kiss my ass. I don’t get it. What’s his obsession with me? I don’t know this man. He’s in his 40’s with a family shouldn’t that be his focus?

He’s mentally ill
He’s attracted to me and bitter he can’t have me
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Why would a married man fixate on a single mother so much?
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