Why do I feel so sad

[Dirtydancing1]

Been with husband around 17 years.
Im early 40s dh mid 50s.
I've been unhappy for awhile as it's like being with a 70 year old.
Never wants to do anything, always a negative about any suggestions.
I didn't want to get 20 years later and realise I have wasted my life unhappy.
I had the chat last night and felt relieved, then today when he got home from work and I've seen how sad he is.
I feel sad by it all and can't understand why as it's what I want.
We have a couple of children and will need to work out house and things.
So just don't understand why I feel so sad as it's want I want

I think that’s completely normal.

It sounds as though whilst things are not working in a romantic sense anymore, you still care for him. This is probably not what you wanted or imagined would come to be and so there will be a sense of sadness attached to that too.