When is enough finally enough?

My husband started working at the same place as me a year and a half ago. Thing were going south before that, not long before that but still.

He left his previous job because he had a PTSD flare up and his psychiatrist told him working in a jail was probably not the best thing at the time.

He hasn't gotten any help for his issues.

He doesn't seem to care about anyone/thing but himself. We have 2 kids together.

Part of me just wants to send him on his way, even if just for a break to see if we just need to end things.

We've been together almost 5 years and married almost 3 years, with a 3 year old and a 1 year old.

I know I'm rambling but I'm very confused and have no idea how to feel or voice any of this.

Any advice/similar stories would be great.