Amy - sorry you find yourself here but you are amongst a kind and very supportive group of people.
First of all, AWESOME job not crying and not attempting to "reason" with your h. We call this acting "as if." It means we act as if everything is a ok. In the beginning it is an act as we are all in terrible pain. But keep taking one step at a time and I promise, before you know it, it won't be an act anymore.
Yes, some MLCErs do come back. However, as Job would tell you, no one can tell who will do so (which is why you focus on you). Some return close to who they were. Some keep traits from MLC. And yes, some get stuck like a scratch in a record.
MLC is a huge mixture of depression and confusion. Logic is gone, as you can see for yourself! Replay is where the MLCer makes a complete fool of him/herself. He's been headed this way for a long while. If you read about the stages, you'll begin to piece together that your h was in denial and anger years ago. There's nothing you did to cause it and there's no way you could stop it.
Read, read, read all that info Cadet sent you. Focus on taking care of you and your daughter. Exercise, eat well and try to get sleep. Keep busy, called GAL here, meaning "get a life" so that you keep yourself very occupied. Post often. And do not contact him unless it is pertinent: something pertaining to finances or your child.
And yes, you are so right, this is NOT the man you want. He needs to go through this and see if he can fix this himself.
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced