i had sexual intercourse with a gay guy despite being straight myself

​ I(24m) am by no means homophobic. my gf (25f) had invited a coworker back for dinner last night, let's call him connor. she told me he needed company, went through a messy break up with his boyfriend. alright, I agreed. more the merrier and it sure was. connor is absolutely hilarious. we drank wine, talked for hours until we lost track of time. because it was past midnight and he had alcohol, I offered him to stay over in the guest room. we broke off for the night, my gf and I in our room, Connor in the guest. everything was fine and normal up until this point. while I was getting intimate with my gf, she kept indirectly suggesting a threesome with Connor. saying things like "did you know Connor is a bottom?" and "oh you and Connor looked so cute together tonight", "are you feeling adventurous?". straight up, I told her "no it's not happening". then she began begging, telling me she promised to help him, that her bf(me) is openminded, that if I refused I will embarrass her and everyone will call her a liar. It all made me very uncomfortable but I gave in. not 5 seconds later, Connor is knocking on our door. and the rest is history. while I'm lying down on my back, Connor rides me while my gf hug my torso and makes out with me to give the illusion it's her I'm fucking. rn as I'm typing this I feel so numb. my head is fucked and I'm questioning everything.