Why would she want closure?

Why would a girl want closure if she already has a new guy?

The girl I was dating and living with developed a relationship with a new guy. She eventually lied to me and I found out she was hanging out with him while I was at work. I left her. Now she wants closure? I know they are still hanging out and texting, but why does she need closure when she already has another guy?

Part of me thinks she feels like a douche bag and wants to talk just so she can find something to make herself feel better and make me look like the bad guy.
Why would she want closure?
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