I'm at a loss right now. What now?

Ice_knight
So little back story. My girlfriend cheated on me a couple years ago with an ex. We reconciled and I told her to not talk to any exes and she agreed, I just didn't trust her. Been a lot of problems off and on throughout. Well today while I was working she met one of her exes, and then lied to me about it. Said she got food at this place we been wanting to try out. Said "oh no I forgot my spaghetti, it was so good" I asked "you eat in?" Which was unusual. She said she ordered to which I called bs. We drove about 15 to 10 min. so she could drop something off to a friend and then ten back. All the while lying straight to my face. Then finally she tells me while in the driveway. She's been talking to this dude off and on throughout since she cheated. One time I really needed her, to talk and everything. I was driving three hours. She was a major jerk about it all and threw a fit about it. Come to find out she just wanted to play apex with the dude she ate with today. That was like a year ago. I trusted her, I even was ok she was talking to this ex. I got through the first time and trusted her.
I'm at a loss right now. What now?
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