Ex and I separated two years ago after his second affair in as many years - transpired he had been cheating throughout marriage. He left for the OW, who was also married. Both families had young children. He only sees children EOW and sees a couple of nights a week for dinner but always drops them home. This summer, he has done one extra overnight. I try to stay away from his life and I purposely didn’t enquire as to whether him and the OW were together. I think I was protecting myself. It has become apparent they are publicly an item now - and two of our mutual friends who would have been closer to him than me have been on dates with them. It’s so hard and I feel very distressed but of course, trying very hard to hold this in front of the children.