My ex-boyfriend was being very affectionate. Why?

Anonymous
I saw my ex recently and he initated kissing me a few times. Not just kissing, like full on make-out. He was just very affectionate, holding me, etc. We ended up doing more than that. Anyways, we don't live in the same city and I know deep down he's over it, but why keep seeing me and doing stuff like that?
My ex-boyfriend was being very affectionate. Why?
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