Meh, there young, isn't like it's anything serious.
I'd say just have fun. Jealousy is just what a normal person would feel, i wouldnt worry about it too much, It's your decision really, you can stay with your girlfriend, and be jealous whenever you see the other girl with another bloke.
You could just carry on with that your doing now. Or you could get with the girl you like, be in a realtionship with her, but who knows you may get jealous when you see your current girlfriend with another boy.
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