I think my girlfriend is cheating but have no proof, what should I do?

Anonymous
Okay so the thing is, me and my girlfriend have been together for two years now. Lately she tells me that she doesen't recieve my messages, needs hours to reply and goes on walks with her mom for an hour and a half. The thing is that she was hanging out with some of her male friends while lying to me about it for months at a time. What should I do? I tried confronting her about how I feel and I expressed my emotions and opinion about and I just tried to be as genuine as possible but she start screaming and accusing me of cheating and telling me I don't love her because I don't trust her. And yes that might seem like I don't but the thing is I don't push myself to feel that way and I won't push myself not to feel that way because that's not something a mental stable person does. So since I tried confronting her about it each and every time I go out with my guy friends she starts arguments, accuses me of cheating and tells me that I should have sex with some other woman. Please for god's sake help me.
I think my girlfriend is cheating but have no proof, what should I do?
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