I (17m) have been together with my SO (19f) for like 3 months right now. I'm having so much fun with her and love spending time together, but this week we've had one of our biggest arguments yet. I was telling her about my plans for the night: my friends and I were planning to go clubbing and they invited some girls that used to go to our school. My ex was one of these girls. We've broken up about 2 years ago but are still on good terms. No hard feelings from either one of us.

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So I told my gf about this and she lost it. She doesn't feel comfortable with me hanging around with exes and simply didn't want me to go. I was already out and didn't think much of it. The next day I just didn't feel good and decided to call her. She told me that she just doesn't want me to hang out with exes, no matter who's with us. I tried to explain to her that there's nothing to worry about and I would never do anything out of line. 

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I completely understand that she's not 100% comfortable with me having drinks with only her, but with other people there? Come on, we've been broken up for more than 2 years and there's nothing between us now. I tried to be understanding but I just can't grasp it right now. I can't be with someone who feels comfortable dictating who I can('t) hang out with. Sure she can be uncomfortable and we can work through that, but she still insists that I never speak to my ex again.. Would I be the asshole for dumping her? It's not about this single situation in my opinion, I just don't feel comfortable with my girlfriend deciding these things.. I had a chat with my closest friends and they are evenly split about this and I really don't know what to do. 

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WIBTA if I have a talk with my gf and tell her it's not her job to tell me who I can/cannot hang out with? If we can't see eye to eye on this, I'm not sure if our relationship would work. 