My gf was still fucking other guys when we first started out

So my gf (f23) and I (m24) matched on tinder. She was hot so I was instantly drawn to her. We hit it off right away. We started dating very early on. I thought things were going great until one night, maybe a week or two in she told me she was sleeping over at a friend’s place. At the time I was suspicious, because at this point we were not technically official but I just ignored it.
That night she was unreachable. I didn’t hear anything from her that night or into the next day. The next day in the early afternoon she finally messaged me, asking if she could come over. When she finally cane back she looked freshly fucked… messy hair, flushed face, same clothes from the night before. She acted normal, but I could tell. I know she got fucked that night. Some other guy had her big tits in his hands and was pounding her while I was waiting for her texts.
About a month later her best friend (F23) was having some drinks at our place and it was only her and I left awake. So I asked her if my suspicions were true, and to my shock, she told me I was right. I had a bunch of follow up questions but she even showed me messages where my gf was texting her stuff like “don’t tell anyone, but I need to get fucked” and the next morning she said “I need to go home but I want to fuck this guy all morning”… It was a very slutty side of her that I never saw. I’d be lying if I said it didn’t turn me on…
Long story short, I approached my gf about it and she was honest finally. We made a compromise and have moved on (I haven’t been exactly perfect either lol). The image of it has been burned into my head ever since. It turns me on like nothing else. Never thought my gf’s slutty side would be a turn on, but here we are.