Would you stay with your partner if he gave you an std?

Please read the entire post before you start judging. I am asking this question for a friend, she is married and early in their relationship she found out she had an std that she got from her husband, They were both young, and she was a virgin but he had been with one girl who had a strong fishy odor and knew she had an STD but failed to tell him until later. My friend really loved him, and ultimately forgave him simply because he was young and dumb and what they had was treatable. I personally told her it wasn't my decision but I will support her no matter what. She is getting harsh comments about leaving him and how they are nasty. Yes I do think STD's are nasty but it's something they treated and is over with. This is NOT for me, it's for a friend. What would you do in that type of situation?