Dear Bob:
We feel what we feel; we don’t choose our feelings. So you feel attracted to your wife’s sister, doesn’t mean you have to do something about it. This attraction is not a … sign of sort that something needs to be done, that fate had put the two of you together, none of these things. It simply means that you have a feeling.
Your wife is absent a lot and that doesn’t work for you, maybe there is a way for you to not be physically separated, might want to look into that, how to make it happen.
anita