Sorry to read that your mum has passed away, I didn't know until I read this post but I do remember your previous posts that described the situation.
Losing a much loved parent is always hard, no matter how poorly they had been or for how long. Allow yourself to grieve, but remember that your mum would have wanted you to continue to enjoy life and make the most of it. We are both mothers ourselves and that's what we'd want for our children too when our time finally comes.
With grief comes vulnerability, and you will be looking at your husband in a different way and judging him on how he is behaving now in your time of grief. I did the same with my ex, as he too was patient and kind when my dad died. However, it didn't last long and he soon reverted to his normal ways and his patience with my grief soon ran out. It's great that your husband is helping you at this time, but the death of your dear mum is not going to change him permanently, and the issues you always had are likely to return. Please don't blindly go back in to a relationship with him through grief, make sure that if you do it is for the right reasons.
Something that may help you to focus on the positive and in memory of your mum and her illness is to become a Dementia Friends Champion. I did this training a couple of months ago to find out more about dementia as my uncle has now got it and I wanted to understand it more to support my auntie. It is free to attend and at the end of the day, if you want to, you are able to go and talk to groups of people as a 'Champion' to raise awareness of people living with dementia and what it means. I found it really helpful, and the analogies that they use to help people understand are pretty amazing. If you don't want to become a 'Champion' then you become a 'Dementia Friend' - something you are already from what you have been through I know. I've already passed my knowledge on to friends and family and it has made them think differently.http://www.alzheimers.org.uk/site/scripts/documents_info.php?documentID=2162&pageNumber=6
Big hugs to you, I'm sure you will be coping as best as you can - just allow yourself as much time as it takes to grieve x