I am not sure if it helps you but I left my DH as he was very depressed, had a few MH issues, he was emotionally distant and was useless with our two DC, got angry at mess and when they were playing up he just couldn't handle it.
I decided to leave, I had made my mind up it was over, and it was in the best interests of the DC's, I was in the process of starting divorce proceedings and moved in with my sister and her DC until I could find something suitable.
Within 6 months of me leaving, he had undertook various treatments, counselling and got a new job. I had serious doubts about things, especially his depression and MH, but I still loved him and decided I would see how things went, under the clear proviso that I would be off for good if he let things lapse.
Fast forward nearly two years and things are great, maybe better than at anytime before we married. DC's are 5 and 8 and love him to bits.
I cant say it will work out for you, but I was literally at the point of no return and things managed to turn around for us.
I hope you can get him to try again, if you love him and he still loves you, there's no harm in you asking how he feels.
Hope this helps XX