He constantly wanted to lay in my arms, he needed security, I gave him this. I don't know why, but it just felt right at the time, as weird as that sounds. We sat on the couch for a few hours, the man is completely broken.
Your story reminds me of the movie Forrest Gump. Your Exh is like Ginny who was also broken. Whenever anything got to deep for her she would run to Forrest for the support and ego boost. Once she got it and felt better she was gone and Forrest was left there wondering what happened.
Forrest had unconditional love for Ginny but I bet it wasn't easy for him. Forrest thought she was worth it so I guess your are going to have to figure out if your exh is worth the ins and outs and ups and downs.