If you are sure your H is in MLC then lying and manipulation are part of the journey.

You are right not to contact him unless he contacts you. Give him apace and time to work out the issues in his head.

The best way to handle it is no confrontations, no relationship talk unless your H intiates it and then validate what he says.

You don't have to agree with what he is saying but listen to what he says and let him have his opinion.

If he has an OW then she is ony a band aid for the journey he must do alone.

Read lots of info on MLC and it will help you understand where your H is and why. Ultimately it is nothing to do with you.

I am sure other people will stop by and give you some advice to help.