How would you feel when your girlfriend gives out her number to other guys she meet?

So my girlfriend/ex always tells me about guys flirting and asking for her number..i never commented about it.. today she met this "handsome" guys he flirted with her and asked for her # and of course she gave it to him..Any way so i broke up with her..im i overreacting it is she just not fucking serious? like if she has sense of humor then i dont need to tell her it bothers me. she should already know..its common sense
How would you feel when your girlfriend gives out her number to other guys she meet?
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