STD = cheating?
I hate to even ask this question because I think I know the answer. My best friend has been dating this guy for 2 years. They are planning to marry next year. She got what she thought was a vaginal infection last week only to find out it is trichomoniasis. She has been faithful to him the entire time. Which means, as an STD, he must have been unfaithful to her. How does she respond? Is there any way it could have been contracted without infidelity? Could it have been "dormant" in him for the past two years? Any help is appreciated. She is devastated.