I exchanged 13 texts with him over the course of January. And I had no idea this was coming.
At the risk of this trying to sound like "You think you've got trouble, try mine on for size", had a similar experience as yours, except in my case it was him telling me he was going to kill himself (he was in another country and across and ocean).
This went on for about 2 yrs.
At some point I was like, "Go ahead and do it, you're bringing me along for a ride I do not want to be on."
But all I did was just listen and try to let him vent and offer some suggestions.
In the end, I got to paddle out with ashes while his mother and father and friends watched from the cliff.
I don't know what you want to take from this, I don't think what I experience is worse than yours or negates yours, but, I am sorry to hear about your friend and I know it is going to be another straw on the proverbial camel's back.
At some point, he said he was going to give me his Paypal account access username and password, but no. Tried to help his ex-wife get it but last I heard, they had not done anything. Am too much of a wuss to bring it up now.