I let him go into the darkness alone.
What about him made you let him go into the darkness alone?
He is to be blamed for being so self-centred. He should have thought about me.
Feeling like others leave you out is natural, but you shouldn't let him go into the darkness by himself. Support your family when they need you.
He should have thought about it before he treated me like that.
I agree that he should have treated you better and maybe he can in the future but only if you give him the support he needs now. Otherwise he might not make it.