Answer:
Tell your girlfriend that you love her and that she has nothing to worry about because the person you love is her and only her. Also say that if she wants, you can stop talking to the other girl and your girlfriend will say "I don't want to control you it's just that..." just tell her simply and calmly "But I love you baby!" and there is a reason why she is my ex and that is because she is an example of what I will never do again! :) Problem solved I hope you stay honest! :)