I'm a wee bit worried again

Well after a reasonably positive meeting with my depressed partner over the weekend, a fairly positive outcome, and me left feeling that perhaps there was some improvement in him, I haven't heard from him again.
This is fairly concerning considering his current state of mind, living in motels, and, or so he sees it, no prospects of a job or future.
I move into my new apartment on Friday, which was the whole reason his depression is as severe as it is. I suggested he move into my apartment with me, pay half the rent, and surely it would be cheaper than motels??? Is reply was for me to please stop asking, that he doesn't want to become pathetic, as he would feel like the deadbeat boyfriend watching me go to work, with him having no work to go to. He then told me I was backing the wrong horse and for me to walk away. This was after us only being back less than a week after spend ten glorious weeks touring America together.
I emailed him today suggesting he just spends the weekend with me in my new apartment to help me put my bed together and connect up my electrical equipment again. I think he needs to feel needed as well as loved and wanted....so here's hoping I hear from him and that there is additive outcome.

Hey Delljoy, I think it's really great that you're there for him and being patient. I know it's not easy, I've been on both sides being with someone who's depressed and also being the one depressed, it definitely takes time and work but I hope things work out for you two. Could you maybe talk to him about seeing a therapist?

He says he has tried therapy and it doesn't work because the main reason for his depression is his dreadful state in life. After being a dynamic business man for years and working and living all round the world to find himself at 57 with no money left and no skills. He says he is embarrassed at the state he is in, and that everything now seems to be pointless.....he is beating himself up about everything, that he can't offer me anything etcetc, now he is running away and hiding from life, from me and his family. He says that therapy won't get him his money back, won't bring his business back or his farm that he also lost after a few years of drought.....he has a point really.
Therapy only works if you are open to it...

Hello, Delljoy. Thank you for these details of your friend's life. Even if circumstances weren't so bleak, I suspect his depression has developed a life of its own.

The chances he'll emerge from this state on his own are minimal. You can't force him to go for help, but I think you are providing excellent support. I just wish your support would be rewarded more obviously and quickly - though that's rarely the case with depression.

I'm really starting to worry big time now, and wondering what step to take next.
I sent him an email last night again stressing my concern, and told him some things I was going to do if I hadn't heard from him today. He hates any fuss, and is a very unassuming and private man. He is not that close to his 2 younger sisters, but I sensed he used to be in the past. His father died very early and he brought them up, but as is usual in families they have drifted apart over the years. I sense that these 2 women have always looked up to him and almost hero worshipped him, his closeness to his sisters was one of the main reasons his marriage split up. I don't know why he and his sisters are now only sporadically in contact with him, and why 2 years ago he moved interstate away from them and has no desire to go back and visit them. Maybe his depression is something to do with it, maybe he is embarrassed for his sisters to see him like this.
I've never met his sisters but they know about me, and prior to us going to America this year he gave me one of his sisters contact details for just in case something happened to him.
Anyway in my email to him last night, I said that if I didn't hear from him by today I would contact his sister, and involve her in the situation. The one daughter that he is in contact with and lives in the uk at the moment, whom I also haven't met, but who also knows me as her dads partner and whom I've said hello to on the phone etc, I have found her on Facebook. I informed him of this also, and that I was thinking of contacting her as I'm sure he has closed off from her as well, so she must be worried out her brain also. If he were aware that I was putting these plans into place he would contact me immediately to stop me doing this.....he couldn't bear to loose face in front of his family as well as me.
I think they have the right to know, certainly his daughter, and I maybe able to gain some insight into his condition from her as well......maybe this is a pattern that he goes through every year?
The fact that he has not responded to this email really concerns me. My gut still tells me that he is not the type of man to do something stupid, but who knows, and his depression, agitation and circumstances in life are so dire, or they are according to him. So if my gut is right and he hasn't done anything stupid.....and I'm praying and crossing fingers and toes hoping my gut is right, the only other option is that he has closed himself off from email as well as cell phone, and this must mean his condition has deteriorated. He is a modern day man, and uses Internet on a daily basis. He even took his laptop to America on our motorbike holiday and it took up precious room in our pannier bags.
Now that I've told him I was going to involve his family, I'm left with a bit of a dilemma. Should I follow through with it or not? I honestly expected him to contact me, so I felt there was not going to be any necessity for it.

hi delljoy, reading it back it seems you just saw him a few days ago ... (do you have plans to meet up again soon?)
if he is a private man, and severely depressed ... i'm not sure it would help much or be appreciated for you to contact his sisters in these circumstances ... and regarding email; when I've been depressed things like emails ... way too hard and requiring too much effort to think about, or reply to; and can just add to the pressure and the depressive thoughts and ultimatums of any kind don't really have the desired effect of helping
i know this must be incredibly hard for you; and that you need your own support as well and hope you find it here
but from what you've shared I'm not sure following through would help
can you go and see him or is he out of reach in terms of knowing where he is currently?

He is totally out of reach.....staying in different motels each night. I move house this weekend, and he was supposed to help me move, put my bed and other furniture together etc. he has really left me in a bind.....and this is so out of character for him, he is normally so reliable. A part of me is thinking he is acting so selfishly......he is my partner, he should be here for me. Another part of me is so consumed with worry that it is like a cancer eating inside of me. And another side of me, is scared for me, what if this is it, what if I never see him again, what if he is dead or disappeared forever, how will I survive? There I've said it, I've got selfish thought too....