Dear CRM,
He's not leaving his wife for you.
Ever.
I know he's been telling you that he's going to divorce her for you, and I know that he says that he's waiting for the right moment, and that it's a delicate situation - but, seriously, it's not going to happen. You know it. He knows it. And sadly, everyone here now knows it.
He loves his wife and his children. You just happen do one or two things that she won't (or can't) do. So he's going to string you along for as long you allow it - because you sit voluntarily on the back-burner, and you are willingly discreet. And if he ever does get a divorce, it won't be because of you, and I'm sorry to say, that he's going to immediately dump you and find another girlfriend because the need for discretion will disappear.
Sincerely,
Toxick.
P.S. You should seek help for your incredibly low self-esteem.