Affairs are always confusing because the people in them are living 2 lives and giving out mixed messages.
The stats show that in an affair situation if the couple involved do not leave their partner within 6 months they are never likely to.
Of course there will always be exceptions.
I think you have to try to understand that yes, this man maybe did love you. It may not be a popular view on this thread but I do believe it's possible to love two people at the same time. But it's only possible to live a full life with one . Your man chose his family.
No matter how much you love him, you must be able to see that this is the best choice for him, his wife and his children. If the marriage had been dead or totally intolerable, he'd have left a long while back because he had the perfect escape- you.
If you do love him and have any compassion then you will see that being instrumental in a break up which involves children is not something you'd want on your conscience for life- when there was clearly some chance their marriage was fixable with you off the scene.
There are marriages where one partner is still in it because they are too scared or lazy to leave and they need an 'exit' affair to give them the jolt. This is not commendable because they should have had the courage to leave sooner. But people are weak and human- so this does happen.
However, I don't get the sense from you that this was the marriage your man was in. If it was, he'd have left.
As hard as it was, you have to understand that you were the 'cake' he was eating. You provided him with some comfort and excitement outside of what was possibly- like many marriages are- a rather dull life where the grass is always perceived as greener.
Your mistake was to allow this to carry on for so long. Yes, breaking up a family for someone else is not good. But shit happens. Had this guy been really wanting out of his marriage and been honest with his wife, and left that's one thing. But he wasn't.
To get over this you have to focus on the shit. He deceived his wife. He neglected her emotions. He may have promised you the earth but didn't deliver. And if he had, the reality is you'd have been the step mum to his kids starting off on pretty bad terms all round.
Sadly, you let yourself get dragged into a fantasy- that he'd leave the comfort of his home for you. You now have to focus on yourself and your self worth. If you really love this man you'll want what is best for him. That means staying with his family. If he wakes up one day and decides he wants a divorce well, fair enough. But I don't have the impression his life at home with his wife was all that bad.
You've been duped. It hurts but you have to try to move on and not contact him. He really isn't worth your head space and one day when you have man who is free to love you, you'll regret all the time you gave to this one.