That is the shit storm on the road ahead of you. I was recently married to my husband in the Twin Falls, Idaho temple for time and all eternity. At parties, they drink soda and play board games. Some of the guests talked about the importance of helping hard core mormons to be open and accepting to ALL their brothers and sisters in the church, regardless of sexual orientation. Jesus might have seemed like a cute, imaginary playmate at first, but on some level I would have been expecting to help her get over it. My faith, while less orthodox, has certainly matured.
There are over promises in the Bible. I deal better with inattention when he is home better than him as well. Mormons defintely play by a different rule set. I could draw some flip-art of a kiss on some post-it notes and send one a day.
As Joanna said, marriage takes some work no matter what, but being married to your best friend, and listening to the spirit brings great blessings. I wouldn't wish this shit on my enemy. For reference we're both in our mids. I had tears in my eyes and goosebumps while reading it. I have plenty to do but I do it alone. It sucks to admit, but I broke up with him after 6 months because I didn't think there was any point if we couldn't be together forever.
I get it; I just don't buy into it. On the other hand, if you believe God is bigger than we can imagine, and is not constrained by religious dogma, you have as good a chance as any at a happy, thriving relationship. We learn sooooooo much from each other. She will likely want you to convert to fix the family. I want to do that though with my husband involved, not be married and be like a single mum. But you will benefit if you can help him maintain his strength.