Why would a ex girlfriends mom make it a point to still talk to me if she sees me?

Like it was a messy breakup because she has unaddressed mental health issues I got sick of being mistreated I was repeatedly called horrible names she would hit me. And when I would say things to defend myself I was in the wrong and she would threaten to break up

Why would a ex girlfriends mom make it a point to still talk to me if she sees me?
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