I've just started to do my GAL and 180s, and I know where you're coming from. It is tempting to say, "See, I can make it without them". But then, I think... my son won't have his father around. I won't have my best friend around. And even though I feel that this is for the best, and that I can move on and even find someone that has the qualities of what I want, I know it won't be the same.
My heart will always be with my spouse. We had a child together. And when you have children, the other parent never truly goes away.
I know how you feel. My husband cheated on me, and it hurts, and I get mad when I think about it. But, I also think the steps it took for him to cheat. I really wasn't the easiest person to get along with.
Do some deep soul searching. If you really don't think you two can be together, then don't. But I know, you're the lucky one to have your spouse want to work it out, and I would give anything to be in your place right now.