Space.
Let him take responsibility for his health. It isn't up to you. And all the love you have can't cure it. Don't believe the lie that it will.
Space... then when he returns, set that boundary. He isn't allowed to do this to you and the kids anymore. His pain is not more important than their mental and emotional health. Say it and believe it. It's true. He has to be responsible for himself. He has your love and support, but the second it becomes a detriment to you all then he has to know what's coming: your absence.
Let him take responsibility for his health. It isn't up to you. And all the love you have can't cure it. Don't believe the lie that it will.
Space... then when he returns, set that boundary. He isn't allowed to do this to you and the kids anymore. His pain is not more important than their mental and emotional health. Say it and believe it. It's true. He has to be responsible for himself. He has your love and support, but the second it becomes a detriment to you all then he has to know what's coming: your absence.