The one thing I really had to learn was just because I knew how to operate in the dynamic my H and I had it doesn't mean it was the healthy way to have a R. I am talking about how things were going after he dictated we were getting divorced and not over the course of our marriage.
Turning to a spouse for emotional support is what spouses are supposed to do. BUT they are also supposed to do much, much more. A marriage is not an entity that can be "cherry picked".
Being used as an emotional sounding board and support system by your spouse who is wanting to end the marriage is not in your best interest. It sets a precedent that you are "good enough" to be there for the hard stuff but when it comes time for the good stuff he doesn't take a second look. You deserve better than that.