How can I get over my Girlfriend cheating on me?

We were out one night and My girlfriend must have already been spitting game with another girl. That Monday and all through the rest of the week they had talked on the phone (which I didnt know about) And the following Sat. Me and our daughter went to my mothers and my girlfriend called this other lady to pick her up. The other girl came into my home in to my bedroom to help my girlfriend get clothes. They even kissed in my front room. I am ready to vomit! I just dont get it.

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