Why is he being so cruel?

I haven't spoken to my ex in 2 years. He cheated on me and when I found out he literally just vanished. Anyway, just heard him and his friends walk past where I live making fun of me.

Not just making fun of me but they were laughing about how my dad abused me as a kid and pretending to be me 'oh I just love living here' and pretending as if I act about how 'amazing my life is' etc.

My ex was horrible to me when I was with him. I know he's a toxic person but to me this just low and disgusting. I didn' think someone could stoop so low to laugh at childhood abuse...
Why is he being so cruel?
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