Hello, I’m sorry to hear your husband if feeling despondent, it does get better! I had my hip replaced 8 weeks ago today. For reference, I was doing my exercises at least 6 to 8 times a day, they are crucial to recovery, I am fortunate in that our house is long and thin and so I have a stretch of about 17 metres back to front to walk.
In the first 3 weeks I was using my walker but felt it was restricting my stride, our daughter is a health professional and says I should be on one crutch by 3 weeks, I tried this and it was fine with more fluid natural movement, gradually building up distance in the house. Back and forward 10 lengths of the house ( 300 metres) 3 times a day, then up to 15 lengths ( 450 metres) by week 5 , 3 to 4 times a day. In week 5 I walked down to the local shop and back on my crutch, about 1km. Ditched the crutch in week 6 for most of the day, out walking regularly now, but still with my crutch for safety. Week 8 and I have been crutch free in the day and can walk up and down stairs freely. Still use my crutch in the evening as a bit sore.
I think the key is regular exercise and keep at it, it can feel as though you are treading water, but it will get better.
There are a few very informative threads on here if you put hip replacement into the search bar, but please remember when looking at others experiences that everyone recovers at different paces and it’s not a completion!. If it helps I am 62, if you have any other questions please ask.