Sorry if my english is bad

My girlfriend broke up with me 5 days before my birthday and lied about being because of religious stuff. the day after that happened, her cousin (that's also my friend) told me she was lying and she wanted to break up with me bcs she wanted to make out with some guy from her job. I'm feeling so stupid right now, and the fact that I could've had avoided this whole situation just makes it worse. I always knew what kind of bitch that girl was, everyone warned me but I still kept chasing for it because I loved her and I still love her. I'm so disgusted with myself for suffer over that mf So now my anxiety has gotten so much worse over the last few days, I can't eat or sleep properly I'm so tired. And to make it worse, I'm in the same circle of friends as her so I'll keep seeing her every day