Would it be wrong to fuck his friend?

I just found out the guy I’ve been going on dates with has a gf and he’s been hiding that fact from me and everytime he’d take me home it’s actually because he had to meet up w/ her. and the kid that’s sometimes at his house is actually her kid 🙃 he had lied and said it was his friend’s kid (another person’s). and I actually know the gf bc all of us worked together before. she used to be his gf then they broke up, and now they’re going out again. which I guess is why he lied about whose kid it was. anyway another friend of his has been in my inbox behind his back for the past couple of weeks. I never told him because I didn’t want to cause drama and I’d just been ignoring his friend, but should I just go ahead and fuck him now? also me and this girl do not get along so don’t suggest that I should tell her, it’d just be WWIII

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