I don't have that issue as I'm single, but have friends and family who have gone through such phases. Most of the time it's just everyone gets stuck in a rutt/routine and starts taking things for granted - it's not that you're not appreciated, it's just he may think you "know" you are appreciated.
Often, from the guy's perspective, his working hard to provide food, clothing and shelter is showing his appreciation to you - by working hard to provide for the family. And he may feel you keeping the house and preparing the meals is you showing your appreciation for his hard work.
It could be that you may just need a little added "romance" to get that spark back. If you think this may be the case, maybe when you and your other half are in a good mood - just be honest with him. Tell him you appreciate his work - don't make him feel that you aren't appreciative of that - and let him know you just miss the occasional "couple" time - the date nights where you can dress up and feel like a princess and he's your prince. That it would be nice if he surprise you with occasional romance things, that you are not expecting these on any regular basis or counting, but one of those "just because" moments he can plan to make you feel extra special. At the same time, be sure to ask if there is anything you can do to make him feel more appreciated in case he may be feeling a bit unappreciated too. Could be he may be thinking you are taking him for granted and you may not realize.
Hope your circumstance is as simple as a conversation to get the sparks flying again!