should I be annoyed?

So my friend has been snapping this boy Mike on and off for a few weeks. Nothing serious, as she goes away to school and likes a boy there, so her and Mike were just friends. He asked her to hang out a couple times. Last night, we were all at the same party and I met Mike for the first time. He wasnt paying attention to my friend at all, he was constantly smiling at or talking to me, and we really hit it off. Tonight, she went somewhere he was and I was kind of annoyed but, like, whatever. She texts me while she’s there and says “hey would you wana go on a date with Mike?” So obviously I say ya. I was relieved that nothing was happening w them bc I definitely wanted to explore things with him and I. Anyways, a few hours later she texts me, “so mike and I may or may not have kissed”.. I love my friend to death but she loves attention from any guy and in the past, when guys have kind of flirted with her and then met me and asked her to set us up, she has seduced them before. I kind of think that once she knew he wanted to take me on a date, she got all competitive like she does and kissed him. Kind of annoyed but idk if I have the right to be