cheating friend

would it be wrong of me to tell my friend i don’t care to hear about her boyfriend? she constantly is unhappy with him all they do is “break up” and her back together. but she constantly cheats on him like for a few nights she had some guy stay over and she had sex, unprotected and then the next day her boyfriend stayed the night and she had sex with him as well. i’ve been cheated on numerous times and i constantly tell her i don’t think what she’s doing is a good idea but she keeps telling me and keeps looking for my opinion but i don’t have anything nice to say. i find it disgusting and just plain wrong. she’s a great friend and is always there for me, but i feel like i can no longer be there for her issues. does that make me a bad friend? i just don’t care to hear about how she’s messing with this guy one night and another the next. it would be one thing if she was single, her body her choice (i’m not trying to slut shame or hate on her cause she wants to be with multiple guys) just the cheating part is hard for me to look past and for me to understand.

update: i told her how i felt and all she said was ok. at this point i don’t care.