Ex cheated on me multiple times, how can I torture him (mentally)?

iamnotshaniqua
I met my ex a few months before I left the country and we decided to keep it a long distance exclusive relationship. Our relationship was about 9 months long...I found out my ex cheated on me multiple times in the relationship when I left the country with his ex, and then more recently with some random girl. This means over 6 months of cheating. The whole time, he's been a lying sack of sh*t and also abusive (that should have been why I left, but I was naiive). He told me and I stopped talking to him completely. He keeps trying to gain closure from me now and wants to talk.

I would like to make him feel immense pain (although I know its not the best thing) for a long time, and for me to heal.

Basically, I feel that if I don't give him the closure he's desperately seeking, that might add on more pain...I know its vindictive but this dude told me he wanted to move in together, exposed ME to disease, became controlling, destroyed my things and was crazy jealous.

Advice ?
Ex cheated on me multiple times, how can I torture him (mentally)?
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