I think getting cheated on changed my kinks

Update:
It’s been a couple weeks since our conversation and nothing much has changed. She did rent out a beach house with a couple of her friends. They had it for 3 nights and I was coming over the 2nd night. They got the beach house to go out to bars near the shore. Her and her friends told me when i got the house the first night they played a drinking game then went out to a local bar. They showed me the drinking game. It was pretty much do what the card tells u to do or Drink “Girls Edition.” I looked through some of the cards and a lot of them were sex related. One question was “Who has the best tits?” or “Call your ex bf and flirt with him” One of the questions was “who was the best in bed” but that wasn’t for my gf. She had “who had the smallest dick?” I never got the answer for that one but it got me so horny thinking she said me. I’m only 4 1/2 inches so i wouldn’t be surprised. My gf been with 12 different men. Another question she was “who would u want to fuck the most” I wasn’t told if she answered or not but im praying she did and I want to ask soon. It make me so hard thinking she was talking about our sex life with her friends. They went out to a club and when she was out I was home and I was jerking off to the thought of her bringing a guy back.

Went I was there for the 2nd night, we went out to a club. Her 2 friends are single so they were dancing with a couple of men. My Gf and I were dancing together and then we went to get a drink. We got a little board and wanted to fuck so we went back to the house. As soon as we got in we started going at. I always start off eating her pussy out. She always tells me she has to cum first then I can fuck her. Soon she did and then we started to fuck. I’m on top and she always likes pulling me close to her. She starts whispering calling me “a little bitch, you’re always so horny. When your home all you do is jerk off your small dick to the thought of me getting fucked by a bigger man. Someone who can actually dominate me how i like. You can’t cause your weak and small” I finished in like 3 minutes. She was stunned how fast I finished and said “you love that talk so much don’t you. You finished so quickly from talking about how small your dick is and how other men fuck me better. She always tells me after tho that the sex was really good but I know she rather me be the dominant one. She tells this is just a fantasy and can’t be with another man cause it’s not right. After this weekend I feel she knows even more now how much i like the idea of her being with someone else.

What do y’all think?
You got her in the right headspace to humiliate you now just got to convince her fucking another guy is not cheating unless that's her kink. Maybe a 3 way to start off.