How do you handle the situation?

My boyfriend threw a gathering for his birthday on Saturday at a bar. A few friends were invited. Drank few drinks and danced a little… as always you are going to meet up with people. Well as the night goes on, some girl came up to my boyfriend with some of her cousins. He introduced them to me (not to mention I hate the fact that he has girlfriends but you know I’m taking the time adapt to it and trust with my might), I smiled and introduced myself back to them… anyway this fat hoe kissed my bf right in my face a few minutes after she introduced herself to me. Even took pictures of my bf & I. High fived me because I made a good choice. Complimented us for doing our thang with our hair & **** (he has a Mohawk and I have short hair like rihanna). She later talked **** about my best friend, boyfriends’ boy & had the nerve to sit at our table giving us smiles saying I was over doing it! Um, no! You don't pull that **** & act like everything's ok. I was already too wasted. I walked away avoiding causing a chaos. I waited for this h0e bag to walk out so I could handle her but she was nowhere to be found, it was like the bar swallowed her in whole… as for the boyfriend, I know you’re all wondering what he did, well as I expected he extended her arm to her and pushed her away, he followed me out and as you see he thought I was mad at him… I was mad at the *****. now I want to find this girl and give her a taste of me but everyone wants me to let it go… how can I if it keeps coming to my mind… please help me =\