Would you be mad if the guy you liked was flirting with a friend?

im worried that my friend chell is mad at me, me and my friend jared picked her up from her work, and the guy she worked with who she liked named zack was sitting in the backseat with chell, but he was flirting with me asking me really suggestive stuff at first, then at the end of the night he gave sabrina a kiss and then he kissed me, just a quick peck on the lips. it was surprsing. but after that she was real quiet in the car, how do you think she felt? i was really .. intoxicated, kind of, at the time. so i didnt really notice what i was doing or if he was doing wrong. thanks.