I'm just back from visiting and have been taking time to ruminate (not sure there's anything wrong with ruminating!) on your recent posts. Margaret is now effectively bed-bound and incapable of "normal" conversation so she is incapable of reciprocating my love for her in any obvious way. She appears to be in a world of her own but a world I can occasionally glimpse and respond to. Judging from what the staff have told me my visits are helpful beyond just the physical chore of getting her to take some sustenance and fluid. They say she is "stronger" when I have been, whatever that may mean. I think that it is probably the familiarity of my voice and the sort of conversation I have with her which is, in the main, one-sided but I try deliberately to keep it in the style of the domestic conversations we've had over the years and I try to respond as best I can to the odd thing she says which I can relate to a situation from years ago. Sometimes she acknowledges, other times not but at least sometimes I perceive a distinct impression that my response to her is comforting - as much from body language/facial expression as anything.
I think that my situation may be the same as yours,
@Dutchman, in that Bridget values your conversation even if she can't respond in the way she used to. To quote Christina Rossetti (again!) if there is in her "a vestige of the thoughts" that once she had then your presence, your love, your tenderness will I believe strike a chord deep down in "the silent land" and she will, like Margaret, perhaps be the stronger for it. Margaret can no longer express her love for me and I accept that it may not be a meaningful concept in her world and I wonder if the same goes for Bridget. Believe that she still values you, that deep down there is something unique that binds you, that you have a treasure trove of life experiences between you and carry on loving her even if dementia has robbed her of the ability to show her love for you. Just believe that it's still there and don't be so hard on yourself.
Ps. I got Margaret to take a full milkshake and 95% of her calorie shot so, so to continue the football analogy, I feel able to claim a home win. God bless