My ex invites me on a date.....with his girlfriend? And she doesn't know about us going out???HELP?

first of all how can you be very close to a guy who according to you cheated and lied and disrespected you? you also say you are gay, so i am a little confused, maybe you are too, however, i feel this guy is basically a dishonest person and i feel he is using you to play games with or to try to make his now GF jealous, i also think that someone should tell his GF that he is bi sexual, with all the inherent risks to her health, even if he practises safe sex, i found out my ex husband is gay after many years of marriage and 3 children, which left us all devastated at the time, if he is so sure of his sexuality then why hide it. I definatley think his GF has a right to know, if you do decide to go with them you could always drop it casually into the conversation , say something like didnt we have a good time when we went to such and such, or if your brave enough ask him in front of her ifn her has checked out the lastest gay club or whatever, if she doesn't get the message then god help her?,, but seriously i would cut this guy out of your life for good, dont answer any texts or calls and tell him to stp discusssing your past relationship with everyone, he is too dishonest for my liking and i do feel his GF should know what he is like before she gets in too deep at least if she knows and stay with him then at least she has an informed choice and is not totally ignorant about his past hope this helps you