Only you can decide when you are ready to get a divorce. I do not believe in the LRT at all. I believe it backfires. I believe it is manipulative. Do not file if you do not want a divorce. BUT...
You need to get your expectations in check. Did you tell him you were going to file because you wanted a divorce? Or because you wanted him to "come to his senses and tell you not to do it?" I think you know the answer. Just be true to yourself. You have absolutely no control over him. He will lie to you. He will do whatever he wants to do. And right now - he wants to have fun. No responsibilities. Be an immature idiot.
I have been on this bb for nearly 7 years. Most of the walkaways do not file. Why? Because it means they will have to make decisions. Do some work. Take some responsibility. And actually, they have no idea what it is they really want.
Your H wants to be with OW. That is clear. Remember that actions speak louder than words. What are his actions telling you? That he wants to be with her but have sex with you? Or that he wants to leave her and move back to you. I think you know the answer.
I don't mince my words. But I am not unkind. My H said the same things as yours. When I finally said "I've had enough - let's get divorced" - he said "great, we've waited long enough". But he did not file. In fact, he lied about the name of his L. Said he had hired the one I was about to hire (he didn't). Don't believe anything he says or does. But do what YOU have to do.
In your other post you say you do not want to phone the lawyer and get this thing going. Then Don't! My lawyer told me to get a separation agreement. But I didn't need to get a divorce. You NEVER need to get a divorce unless you want to remarry. So DON'T!
Your H is financially generous. Mine was not. He was happy to see myself and my kids including one very severely brain damaged son move out of our handicapped accessible home. Because he did not care. He did not contribute. He was a total jerk. I am glad to be rid of such a monster.
As long as your H is not being a jerk about money - then why file? As long as you are not ready for a new R or want to get married - why file?
Sanderika - you do not have to do anything you are not ready for. It is your life. You get to decide. And once you do it - you can't take it back.
Just my opinion but Last Resort Technique is NOT the way to go. I think it is ridiculous and amounts to game playing.