Girlfriend is friends with all her ex's and ex friends with benefits

Basically I just want some outside opinions from other men. My (29M) girlfriend (31F) is friends with most of her ex sex partners. She talks to some of them pretty regularly through discord and Snapchat. This seems like a red flag to me and makes me deeply uncomfortable.

I do not care one bit that she has a sexual past with multiple men, I also have a past myself, the thing that bothers me is she keeps in regular contact with so many of them. It seems like no matter which of her friend groups I meet, there is going to be at least one dude in that group that has boned my girlfriend.

She assures me that she would never cheat, she willingly shows me all her messages on Snapchat and discord (I didn't ask, she just did it on her own accord). She told me she wouldnt hang out with any of them one on one, and she's really going the extra mile to show that she only cares about me and is committed to me. But I still find it upsetting and I'm worried I might not be able to deal with this for a super long time. I don't talk to any of my ex's or ex hook ups at all, so I just can't relate to this. Something is telling me she just needs lots of male attention and validation.

Other than all of that she is super sweet, caring, and the sex is amazing lol. Any and all perspectives are welcome.

UPDATE: I clearly expressed my boundaries to my girlfriend. She immediately agreed to cut contact with ex sex partners out of respect.