Recently I found a lot of messages in my dad's cellphone which he had sent to a married woman. In these messages they are talking about meeting each other, exchanging gifts and even touching(there's no mention of sex).
On thinking further I remembered a late night argument between my mom and dad about 10 years back regarding affair with the same woman, as I was in a separate room I don't think they knew that I could over hear them.
A few years back too I had found some flirty message he sent to the same woman... When I confronted him about the messages he said it was just casual flirting and there was no harm in it.
My father hasn't been the best of fathers and neither the worst of them. He has been a good parent. But obviously he has not been a good husband. I'm not sure if my mom suspects him or not. I'm not sure if I should confront him again. Should I just erase the messages and turn a blind eyes to his actions? I'm very confused as I work with him in the family business and seeing him everyday, I might just loose it and get in an argument with him.
Please tell me what to do.