I don't mean to invalidate your feelings, but the two of you have gotten married a total of seven times. That's seven times of "till death do us part" and broken vows. That's seven times of heartbreak (presumably) and disentangling your lives emotionally, financially, etc. That's a lot of turmoil!

Now the two of you are involved in a relationship that's pretty good. Why not just ride with it and enjoy it? Why not try something new and if it works?