sorry that things are not going for you the way you would like. sounds like "dealing" with w's condition wears on the both of you.
I would not give much meaning to her constant question of whether you'd leave her due to her condition, looks to me like you've done plenty to assure her you aren't going anywhere. perhaps it is just part of her depression to think that you would.
sorry I don't have much to add for you, feeling a bit down myself these days.
