Been together 25 years and married for 19 years.
Like others have said, we fundamentally like and get on with each other (and love each other of course!) and we are well suited. Our roughest patches were when the children (two of them close in age) were little and there was a lot of bickering, not enough time for each other and I basically put the kids first (rightly or wrongly).
We never had a big acknowledgment that there was a rough patch and I'm not even sure either of us was aware of it at the time but now the children are teenagers and we feel like it's just us again a lot of the time I can see that relationship wise, those years were quite tough. But it was a different phase of our lives and we just didn't dwell on it at the time and we both enjoyed doing family things even if there wasn't enough couple time.
My husband is basically a lovely person too and loyal and it helps that he didn't kick up a fuss just because he wasn't getting enough attention from me.
The other thing I would say is not to fall into the trap of thinking that the grass is greener. If you really try and imagine life without your husband and what the reality of that would be going forwards, is that really what you want?