Do you feel like you are missing something from your relationship right now?
Do you imagine what it would be like to be with someone else? If so, what does that imaginary someone offer that your husband does not?
Maybe you are thinking that this M does not suit you, but in my experience, sometimes just having a single need going unmet can make the whole M feel like it isn't right. I'm just curious if maybe the M is 95% right for you but you are missing a little something and that is skewing things?
If this is the case, and if you can identify what it is you are missing, what would happen if you could fix it?
As a quick example, sex is a major need for me. If my W and I go without sex for a little while (a week, maybe two), I understand. Longer than that and I start to wonder why she doesn't love me, what is wrong with me, maybe we aren't meant to be together, etc. It really escalates quickly for me. Remarkably, after a stretch like that, like the moment after having sex again I am immediately 100% back into the M and wonder what the heck I was thinking before.
The 'someone' exercise above might help you identify what is currently missing if it is currently missing. Then you and your H can work on that and who knows how things will be after that if you can improve that area of your M?