Ditto what Lenny said. (well put BTW Lenny)

Unless you can both see clearly, nothing will change. And if it is going to, a firm commitment must be made by both. One on & on off will not cut it. Perhaps a short separation is in order. Can you get separate places to live and maybe just date? You really can't make a sound judgment while under the same roof (in my opinion).

And if he tried suicide, he needs to work on those issues also.

If it was me, I'd suggest that when he gets his life in order, maybe you can talk about your future.