TL;DR: Ex cheated on me a couple months ago, messages me out

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TL;DR: Ex cheated on me a couple months ago, messages me out of the blue.

>Be in Valentine's Day
>Couple days prior (Online) female friend mentions she wants to tell me something
>ask her what it is, she says nevermind
>pester her and eventually in Valentine's Day she asks me to be her Valentine
>say yes and figure it's as friends
>few days after that she admits she likes me and we start dating
>about 5 weeks later she's acting strange
>says someone tried to kiss her but she didn't let him
>few days after that she feels guilty and admits she actually did cheat
>says she needed physical touch and she's sorry
>break up with the worthless roast
>now all of a sudden she messages me out of the blue
>says, "God I'll probably end up regretting this. Heyyyy, how's it going?"
>sends another message saying she misses me
>tell her I doubt it
>hear she's dated three people since we broke up
>she writes, "Doubt all you want"
>say "okay I will"
>she doesn't reply
This was a little less than a month ago. Wtf do I do fellows? I saw another thread about some girl who cheated on her boyfriend of 4 years and now I have this huge rage inside of me.