Girlfriend [F35] has been cucking me [M30] with a younger guy [20]

My girlfriend had been getting a bit distant from me and then I eventually learned she had been seeing a guy, which I suspected. She met him online and he came over one night and they hooked up that night. She told me they were cuddling watching TV on the couch when he started to get more handsy, and eventually they were making out. She pulled his pants down and sucked his cock while his hands went all over her. He ate her out and they had sex on the couch, and eventually took it to our bed and he stayed the night. They had sex multiple times that night and have been pretty consistent since.

I didn’t know about it for a while but eventually I found out and she’s been more open about it since. He has been over when I was there and I have overheard them having sex. I’ve cleaned her up after he came inside of her as well. I also saw his passcode for his phone and went through it because I was curious to see their conversations (wrong I know) and I came across them talking about me once and she told him he was way better and had a bigger and nicer cock. They also made fun of me a bit which hurt but also turned me on like crazy. I also saw some of his messages to his friends about her, saying he was fucking an older milf and bragging about it essentially.