You and your H must be really secure with your M to be ok with the continued contact with old flames on both sides. My hat's off to ya, I don't think I could pull it off.
I'm not a very jealous person. There's no reason to be with H. He was 36 when we married, had never married or even lived with a person before. And yet he chose me to share his life with. That in itself is a security.
I can't say that I have been that cavalier in past relationships. While I was never actively jealous, except in one relationship where I felt insecure the entire time I was with the guy (with reason), I don't think I would have condoned it.
I don't know why I feel so differently with H. I think maybe it's because we met in a time in our lives when we were mature enough to know what we wanted and old enough to both have histories. We're in our late 30s and early 40s and have been married for 4 years.
There is one woman in his life, an old "together when we aren't with someone else" girlfriend. She used to set my teeth on edge. I think it was because she always came when I was at work and never when I was home. There was a sneakiness about her. But then I had the opportunity to see them together. I know my hubby and know when he wants, and he treats her with a backhanded affection you treat a good friend. So, my teeth are no longer on edge when it comes to her.