My friends warned me about this girl my boyfriend used to always check out at work and now I find out he cheated on me with her?

So my boyfriend and I don’t work at the same place but my friends told me how he would check out this girl when I’m not there and I didn’t think much of it since they said he doesn’t talk to her at all or flirt but now I find out that they slept together! What does this mean for our relationship? Who does he want to be with I’m confused
He’s been wanting her for a while and will break up with me soon
He’s been wanting her for a while and wants me to break up with him
He’s been wanting her for a while and waiting to see if she wants him before breaking up
He doesn’t want her and doesn't plan on breaking up
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My friends warned me about this girl my boyfriend used to always check out at work and now I find out he cheated on me with her?
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