Have I overreacted?

This morning my boyfriend told me that a girl from the past was texting him all night. He's going away for the weekend with friends and their girlfriends are going but due to previously arranged plans I'm unable to go. This girl from last night has found out I'm not going and text my boyfriend asking if he'd take her and give her a chance.

Its made me so angry that she's had the cheek to try that, and I've gone mad that she's done it, have I over reacted or should I just leave it and pretend nothing happened?
Have I overreacted?
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