No matter how much you are told here not to dwell on om and what is going on "over there" I know it makes you sick to your stomach, and you can't help thinking of it now and then. I still think of it in my situation sometimes. Of course, we have to make the thoughts stop taking up so much space in our heads.
You told a few things about om, and I wonder if he will just kind of slither away eventually. Since he has a job in another town, and comes to your town every other week, I think you said, it should get old with him. I don't know if he has a family, or what, but from what you said about his character, he doesn't seem like the stick around type.
You are right, you will have to help heal your R one day, hopefully speaking, so you are thinking right, but that is for much later.
You detaching will get easier, (don't know if that is the right word)as time goes on. The pain in your heart will be less acute. If things don't work out, you will be able to find someone who appreciates who you are. I have no doubt of that. But, I have lots of hope for you and your W. Just keep up with what you are doing, live for yourself and those little ones, and get to know yourself all over again.