You're going to hell for fornication and adultery.

3YO Monkey: Yeah, yeah, yeah, take it, bitch.

3YO Girl: I like coloring!!!

Yeah tbh there's no saving the friendship, and you're equally guilty in this situation - knowingly ****ing someone with a bf is pretty ****ty. I also agree with elph that this is not a polyam situation, if it were that would have been communicated between all parties. I have a feeling you already know all this though violet and you're just looking for validation/legitimization for continuing ****ing her. And ffs don't tell her you love her unless you really do.

No, I'm saying that maybe she's polyamorous and doesn't know it.

Eh, not an excuse for cheating at any rate.

Nope. Why I know that relationship will fail.

I'm not going to pretend I've got the answer, but whatever you do, throwing out a lifelong friend seems like the worst course of action.

Maybe you two shouldn't be doing this when she's in a relationship. That's not hard to see. Why not just bring that up with her? Tell her you feel that it's wrong and hear her side of it. Chances are she will agree. It might cause short term tensions between you, but if she's really a good friend, it wont likely kill off your friendship forever.

Yes because everyone that cheats is poly. Lol

Right, and everyone who's polyam cheats lol. Polyamory is an agreement and commitment to relationship dynamics, not necessarily an orientation.