The woman you slept with told you it happened every couple of months. Why do you doubt it was real? I hope you will go see a therapist. If you need the therapist to tell you that you have a real issue, tell the therapist that and see what he/she says. I think you're looking for some validation? If you think you have a problem with this, that really is reason enough for you to see a therapist. It's what you think and that is causing problems for you that matters. Good luck.