thus EX's really matter

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i thought that i was having a good day already...ive started my day right and happy..but suddenly my girlfriend approaches me and said,"i commited a mistke, i send a message to one of the friend of my exboyfriend and asking how is my ex"...im just wondering,im not angry with her or what but when i heared what she said my heart just started pumping faster and faster and it started my headache... i know you might even said that this is just a small thing to cause a fight..but me and my girl already talked that she should not make any communication or any connection with his ex because of a bad past(very bad) with her ex lover.. what can i do about this..do i have the right to angry?what would be the best thing to do or say??and why??