I am having the best sex of my life with a guy who might not be in poly a relationship after all. Should I bust him and tell his new girlfriend?

Anonymous
He and I started having a sexual relationship while he was in a polyamorous relationship with his then girlfriend (according to him she was ok with us having sex) but now he's broken up with that girl and is with a new girl.

So he hit me up today to ask when we can hook up again. I asked if his new girlfriend is ok with it and his response was something along the lines of "that is just between you and me babe". When I pressed further as to whether he would tell her we were messing around, he said that if I insist on it then he will tell her about it.

I don't know what to think because he alluded to, in the past, that he dates girls who are ok with his poly lifestyle. But now I am starting to wonder if this current girlfriend of his is ok with it after all. I don't know what to do.

I mean, should I break it off with him for seemingly wanting to go behind his girlfriend's back and get with me? He is such a nice guy, or maybe he's just manipulative, but omg he is so good in bed.
I am having the best sex of my life with a guy who might not be in poly a relationship after all. Should I bust him and tell his new girlfriend?
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