Divorce Almost Finalized

So here is the thing. My divorce is finalized on June 3 or so. I had a most fantastic marriage/love affair for 6 or 7 years, and then a good love affair for another 7 years, and then 12 years of friendship but real separation. I am not gonna regret being the happiest man on earth for the first six or seven years. Yes, I paid with a lot of pain, but that is dwarfed by the happiness I was allowed to share in during that time. Still, my back has been bothering me for the first time in my life--I've got a really strong back, built by carrying and inserting a few thousand Sunday papers for years as a 13-14-15 year old. And that bothers me. But I know the back is also where we carry the weight of things that affect us. And today it hit me that I'm okay with the divorce but not totally happy, because it means that someone who really loved me is throwing me in the garbage. And that's okay because people change, but there is some part of it that hurts to my soul. How did I fuck this up? What did I do wrong? How come I couldn't fix it? What's wrong with me? And the answers to those questions have to come from me. This was my screw up. I messed up and I didn't check myself before I wreaked myself. And for the first time I'm letting myself cry about it because it really sucks. We promised forever and that didn't even last 10 years. I am going to have to go into this some, and hopefully, come out with, if not answers, which I don't expect, at least some letting go, even if that proves harder than I expected it to be.