You do sound like you are very stressed Rose, I know you and I have discussed on a previous thread of yours about your bf's dementia and I think I said back then from what I've observed those in close relationships with people with dementia often experience a kind of grief as the relationship changes. That is one aspect of what you may be feeling now, the loss of the previous relationship. Dementia erodes empathy and reasoning skills, that may be compounding his behaviour towards you.
On the other hand you have written so much more in this thread about your relationship before dementia began, and it reads like he has a history of taking you for granted.
To address your original question, yes I think being understood helps hugely. I will relate my own experience but will hide it as it may be triggering for some:
I am sorry you have to experience this and would encourage you to seek support from those you can, whether family/friends or MH/carer support groups. No one should have to go through this alone. Take care and reach out here when you can.
