I don't think acting and pretending to be into it is healthy. It probably only makes you even more resentful of it. I think you should name it everytime you're not feeling it, just as you would in bed. And you guys could agree to process your feelings together - as an act of sharing vulnerability and intimacy, rather than an act of trying to fix something. 

Maybe there are elements of erotic connection that you could agree to meet on virtually. It's great that he's hot for you during the week. Or is he?  This would be interesting to explore. If he's genuinely into the connection with you then he would adapt things to meet you where you can be met. If he's not noticing that you're pretending to like it, then maybe that suggests he:s just in his own head the whole time.