One has to be very careful, in so many ways, when seeing (dating) a married man. There is an allure, danger, of getting into someone elses cookie jar. Sort of like having sex out in public, you know its wrong.....but you go with the moment.
That said, when I was a young man I did date a married guy who had kids. I was young, dumb, and full of cum. He got a divorce and yes my name was brought up in divorce court. Very hard to live with for many, many years. Must be awful to be married but want the gay thing too.