AITA for sleeping with the father of my daughter's boyfriend?

Last Sunday, we hosted brunch at home to meet the parents of our daughter's boyfriend. While we were on the patio with his father, he confessed his marriage was going through a rough time and that his wife kept gaining more weight. At one point, he gave me his phone number and asked me if I wanted to meet him for lunch in a restaurant out of town.

I've been dealing with some issues of my own for a while now and I just wanted... I don't know. It happened. I don't have feelings for this man. But I can't help but ask myself if I should see him again, just to have fun.

Just so you know, my husband's often out of town for buisness though that's not really the reason why I'm doing this.

I don't think anyone suspects anything though I can't help but feel like someone is watching me all the time. I guess guilt and paranoia will do that to you.

Also, that's not the first time this situation happens...but because of this man' s relationship with my daughter's boyfriend, this makes all of this difficult. This is my daughter's first boyfriend and they seem happy. I don't know what's going on in this marriage and it's none of my buisness. I don't expect anything from him except company. And I can't really talk to anyone about this.

What do you think?