"He flirted with another girl!"

Last weekend, my boyfriend and I went to his friend's house party. I didn't really know anyone, so I felt kind of shy. All of my BF's track friends were there, so he was chatting with everyone and not really talking to me. I spent most of the night sitting on a couch by myself, but I didn't really mind because I wanted him to spend time with his friends. Finally, I got bored, so I went to the bathroom. (I figured I'd put on more lip gloss or something!) When I came back, my BF was talking to some skanky girl. (She wasn't even pretty!) Then, I saw her write down her phone number and give it to him! (I couldn't believe it!) On the car ride home, I told him I saw him flirting with her, but he totally denied it. Should I break up with him?

He Did What? Flash Meter

HE GAVE ME MY HOLLYWOOD ENDING!