My Girlfriend Broke Up With Me. I Slept With Some Other Person. Have I Done Something Amiss?

My Girlfriend Broke Up With Me. I Slept With Some Other Person. Have I Done Something Amiss?
We dated my ex for 16 months. We separated without any tips to getting right right back together. Two weeks later on I'd a single stand with someone I don’t know. 1 week later, my ex calls and indicates we should try to get back together night. In subsequent conversations, she asks me if I experienced slept with anybody. Becoming a honest guy, we reluctantly informed her yes...