I dont if I should tell her?

This girl is have been seeing has many male friends and also claims to. be gay. Smh. I was over at her house and we had just done the nasty. She fell asleep ans her phone kept going off. Eventually I got up and went and checked it like wtf. I ended up going into her messages. She has many dudes she is messes with. Now I dont know how to feel about it, her and us. She said she is only seeing me. What should I do?
I dont if I should tell her?
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