Relationships

Should I message the girl my bf cheated on me with to know exactly what happened?

The thing is my bf and I broke up in around April of this yr. Then he was talking/seeing this other girl he met at the club. I went no contact annod was moving on until one day I found out he called my mom and asked her to talk to me but I told her to tell him I'm not at home. Another night he came knocking on my door and I ignored it. Then the next day he called my job to get a hold of me and my friend told me to talk to him and see what he says. So basically he came back telling me he doesn't even know what was going through his head and that he doesn't want to lose me. We got back together in July. He gave Mr his password to Facebook and I was curious so I checked his previous messages which he thought he deleted permanently. Turns out he was talking to this girl I'm not sure about seeing her but they were flirtingand everything. He told me she meant nothing to him and none of th at stuff is ever going to happen again. So I was looking at my friend's pic on Facebook and I barely noticed it was him and the girl in the background. He looked like he was trying to apologize and talk to her and she had her hand out like she didn't want to hear anything he had to say. So that was the beginning of August he went to some party and met her. Should I message this girl and see what he has been telling her and how far they' ve gotten? I'm just curious to want to know to just cut him off for good and if I can hear it from this girl what was going on between the two of them it'll help me get the strength to move on. I mean it sounds ridiculous and crazy but that's why I am asking on here for opinions if I should send her a message and ask her or what?
Should I message the girl my bf cheated on me with to know exactly what happened?
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