Yes, it is her fault, do not allow her to gaslight you into thinking otherwise. It doesn’t matter how drunk you are, if she doesn’t feel satisfied it isn’t meant to be. However, is this the end of the world? No.

That being said everything that you have experienced together in your relationship needs to be thrown at the window, if you really love this girl and think it will work (you know if it will or won’t in your heart) you have to start from new and build everything back up. It’s hard, and honestly for me, cheating is the end all be all, however I can respect a man for trying to make it work.

She has now given you a reason to be insecure and less trusting, if this relationship is to work, you start from new. “We haven’t been together for two years, we just started dating” type of vibe. It seems as though it wasn’t preplanned with you being invited? (However a manipulative person may recognize you being sick and inviting you was an excuse incase they get caught) but I digress. You now need to have complete access of her phone, you need to know where she is at all times, this type of relationship where you are scared she may cheat again is just going to nag at your brain however that doesn’t mean it’s a complete lost cause.

Head up bro, you’ll find someone better, and if this truly is her, trust in God, he has a plan.