My stitch is so very similar to yours. My h was with ow then broke up with her and seemed like he was on his way home when his 40th bday approached and then he met ow3. Now she is the love of his life and he has made a family with her and my children.
It does not sound to me like you are done. Your h is still out there lost and searching for happiness. Do not let appearances fool you.
You do not have to give up if you want your family back. You also do not have to make any decisions now. It is possible to move on and live a full life without a d. There is no closure with a d anyway.
Take some time to really decide what you want. Do not base it on what your h is doing or not doing. You are his wife. He is in mlc.
I know how hard this is. But you are getting stronger every day.It does get easier.