<human>: This isn't a long one, but basically this guy has constantly hit on my girlfriend since they met. It reached a point where he was rubbing her shoulders and blatantly flirting with her in class (they go to the same university), and I asked her to tell him to stop as it made me extremely uncomfortable. However, I just learned that my girlfriend went to dinner with him tonight at a restaurant off campus after class (just them), because "they were both going to eat so she didn't see why not". 

This makes me really uncomfortable because I have asked her to be careful around this guy in the past, but it seems like she has disregarded my feelings. Am I overreacting?

Summarize the given text in a few sentences.
<bot>: GF went to dinner after classwith a guy who I've previously asked her to avoid. I feel hurt but I'm not sure if I'm in the wrong.