Working From Home With My Partner Isn't Easy...

I've been working from home for almost two years now, my job's gotten really demanding. And yeah, there's this thing with my partner and I - we're in a long-term relationship but the more I'm stuck at home, the less interested he seems to be sexually. It’s not like it used to be where we'd just dive right into each other... Now, it feels like work too. So today, after another day of non-stop emails and deadlines, I finally suggested we try something different. Something spicy. And you know what happened next? He agreed... reluctantly, but he did agree. We got into this roleplay situation where I pretended to be his boss and he was my intern or something like that. I laid down on the bed with a professional demeanor while he stood in front of me in some flimsy outfit. As soon as we started, there were no words just hard breathing. He undid my blouse, revealing my breasts... he kissed them and then moved lower to my stomach. I spread my legs for him; he pushed aside the fabric covering me and slipped a finger inside... It was intense but it didn't feel quite right. He pulled out his fingers and looked at me with an uncertain expression. Did it bother you? I asked, not knowing what else to say. He just shook his head... but then he started to move again. This time, though, there was no passion or heat. Just mechanical motions back and forth... I felt so disconnected from him during this whole thing, despite the physical intimacy. The more we went on, the emptier I felt inside. When it was over, I just lied there... staring at the ceiling, wondering what happened to us. Is this normal? Am I the asshole for wanting something new when work's been stressing me out so much? I hope someone can help me figure this out...