My girlfriend talks to one of her guy friends who's way older than her (they had feelings for each other and I have no idea if she still does) way more than me, every time I approach her with this she says she never has feelings for this guy. Even know I've caught her flirting with him and her friend called her out on it too, I want to talk to her about it more but she always tells me that I shouldn't worry about it, and that I'm insecure about our relationship. I don't know what to do right now.

All my friends tell me to dump her but I really don't want to that's why I'm coming here...