Should I confront them?

I've been with my boyfriend for 4 years and I went snooping and just found out that 3 and a half years ago he had sex with a family friend of my family one time. She was 45 and he was 20. I read where they were both saying to each other that it was a mistake and they don't want anyone to find out about it.... show more I've been with my boyfriend for 4 years and I went snooping and just found out that 3 and a half years ago he had sex with a family friend of my family one time. She was 45 and he was 20. I read where they were both saying to each other that it was a mistake and they don't want anyone to find out about it. She said she would be humiliated if anyone found out. Should I confront them or let it drop?
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