Husband attempted suicide

Sisters please help :( and please be gentle, I know some will have certain views on my situation but please be gentle with me.

My husband is in jail :( he isn’t a criminal, not for drugs or anything to bad but that’s our situation. We have three children, he went to prison at the end of my pregnancy with our 3rd and yesterday he attempted suicide :( I’m shocked, numb and sick. He took a blade and slashed both wrist upto his elbows on both arms

I knew he was missing us and not coping very well but never EVER expected this. I got the call yesterday he was in medical and went and seen him today, the sight was horrendous. His wrist were all bandaged but I could still see how much blood is under them, he was in a medical gown(he is normally in prison clothes when I see him) and we had a guard stay within reach of him at all times.

I don’t know what to do, am I failing as a partner? I’m standing by him completely, no that’s just me thinking silly. He endured years of horrid abuse both mental and physical as a young boy continuing right through to adulthood, I knew he had anxiety and depression but never imagined we would be here.
How do I support him? What do I say? I don’t want to make it all about me :(

I lost my brother to suicide so I’m prettified right now. I’m a mess!! I’m so scared, the state I seen him in today has shook to the Core.
Please please PLEASE someone tell me how to Ben there for him.

He is In prison for a night out gone wrong, we were at an engagement party while I was early in my pregnancy and I was asaulted physically and he reacted to protect me which lead to him being in a physically fight and now we are here.