What should you do when you accidentally overreacted with your girlfriend?

yaboy123
I was bothered this guy that used to like her but she didn't like back got in contact with her. I told her this bothered me and she said she "okay i will stop talking to him" and i said thanks. I went through her insta and he commented on a pic "the guy that took this pic is sexy" (him) and she replied with "das tru" and i asked about it why she lowkey called him sexy and she said "um okay?" I felt as if I've overreacted and I don't know what to do about it.
What should you do when you accidentally overreacted with your girlfriend?
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