Love life

Me and partner have not been having sex as much as we used to I was okay with that but now recently it feels like it’s more of a chore for him from my perspective to the point where I feel like I’m loving the sex when having it but then when I think about it another day it’s like I don’t think that euphoria that’s usually there is only coming so much out I don’t know what to do as I think it’s because he works toms so he’s tired any ideas ?