Don't think too much la. My c6's ex is living opposite to our home. They grew up together. My c6 and I am together for 17 years. Only in the recent 3 years, the ex stopped looking at my c6. I took this very easy. I only looked out the window to have random check on them when they walked the dogs. Everyone has a history that no one can wash away.
The ex had many boyfriends before, and I heard from my c6 that she might become a lesbian. My c6 is her first BF.