Idk what to do man

So my gf is honestly just making me mad and im a very jealous person so sorry if alot of this is like not a problem im just ranting. So a couple weeks ago she was on her phone and going through messages and I see some dude ans shes like oh thats my ex I blocked him, so im like oh okay its whatever idc. Turns out he was not infact blocked and he been like hitting on her without me knowing. She sends pics of herself to other dudes too. She was also like comforting this other guy being like oh im always there for you and stuff (This part probably just me being jealous) but like yeah idk what to do she says sorry but dosent change anything. So yeah idk 🤷‍♂️