This is a familiar dilemma for me too!
My boyfriend and I have enjoyed shopping, discussing, preparing and eating lots of meaty dishes for as a long as I can remember. One week he went out of town for business & I watched Food Inc., read The Kind Life, and I knew I could never eat animals again.
I took a lot of inspiration from Alecia's "Kind" approach in thinking about how to deal with him. I decided that I DO NOT want to buy/prepare ANY animal products, BUT that I couldn't make that decision for him.
So we have compromised, of sorts (in a way that doesn't involve me eating anything from animals). We initially agreed we would cook together every other night. We cook "his" meat & unhealthy stuff like mac & cheese & I cook my kind stuff; the next night the kitchen closes & we each eat yesterday's dinner.
We BOTH get our meals as we like them, and in the meantime, I'm observing that he is increasingly taking to my food. I try to use words like Alecia just to describe my food in an appealing way (I think I called my quinoa last night sexy), but I also try to encourage any step he takes in the right direction while being completely non-judgmental about what is on his plate.
I accept that he may never change his mind, but I think I'm winning him over AND my drastic decisions to live KIND have actually made our lives and time in the kitchen together more interesting and fun.
Good luck to you.