Is it possible your longing for this man is symbolic of other things?
I don't believe there is only one soulmate for everyone. I believe we can love many different individuals in our lifetimes.
You have a lot to work out in your head. I'm sure running off to this man might be really appealing as an escapist fantasy. But honestly you've got some young kiddos who need you. That doesn't mean you need to stay in the marriage, just that you can't be impulsive.
You're also questioning your religion, which is totally fine too. I wonder if it's best to start with that and figure out the family stuff later? There are a lot of facts about the org's teachings and behavior to learn.
Finding out about true facts is not apostasy or bad--even the Society has published stuff about it. <<That link has quotes from Society literature with no comments, so it's not an apostate site at all.