My ex wants me to cheat on my boyfriend with him?

I have know my ex for 6 years now and we were together for 5 years. I will always love him but I moved on to someone else and he knows about my boyfriend. Yet he still asked me to come see him and say he wants me to sleep with him. I told him I have a boyfriend and he knows that but he still ask to see me.

Why would he do that? Does he just want to use me for sex or ruin my relationship?
My ex wants me to cheat on my boyfriend with him?
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