Am I the Asshole for Not Paying my Ex for Sex [MF]

Disclaimer: This is not my story, but a crazy story a friend recently shared with me. I am a reddit user and fan so I asked them to document it for posting. This is NOT a throwaway account.

~♡~The Story~♡~

I can imagine that the title stands out. Okay so this is what happened. I (23m) occasionally text my ex (21f). She would sometimes hint at the possibility of us having sex sometimes, of course with no strings attached. Let me also mention that she does have a boyfriend(24-26?) and a kid (3) with that same boyfriend.

We were texting and I straight up asked about her coming over or if I could see her and she said I would have to pay her $150 for her company and she was dead serious. She even made it clear that she has no problem cheating on her man if she’ll be paid for it. I have a shit job so I’m making like $200 fortnightly so I thought that was way too ridiculous to consider. But I played along and spoke as if I would be okay with it. She said I should send half the money to her account like it’s some sort of down payment on the coochie and the next half after we smash. I told her I won’t be sending any money but I will pay in cash after the dirty deed was done and she agreed.