Me and my Gf broke up like 3 weeks ago. During one of our gatherings (GF was not present) we played truth or dare and my friends decided that it was good dare to give them my phone and let them call someone and tell them something. After a bit, they decided to call an other friend of ours and tell him i was cheating on my GF with a girl (we will call her M) that was at the gathering with us (as a joke), the joke backfired, but that is beside the point just wanted to give context. Now i'm single, but there is one gathering coming up soon and the girl is coming too, the thing is my friends are pushing me towards fucking "M" she is cute and we vibe together with no issues, but i would feel awful if I would do something with her knowing, that the joke will kinda turn up to become reality.

Me and my Ex are on good terms now and that is why it makes me feel like i would be cheating on her although we aren't together anymore. What am I suppose to do, try something with her and feel like shit or just vibe with her and do nothing. Help me out, please