No it doesn't sound to me as if he has MLC. It sounds to me like a man who has a mistress and a wife.
Even allowing for the often over used MLC senorio, he should still be showing by his actions that he is committed to rebuilding your marriage. Falling over backwards to be transparent in all areas of his life to gain your trust.
I admit to being skeptical about alot of advice on dealing with MLC-in fact I often think the spouse may have read the book and knows we wont say A,B,or C in case we spook them or view it as controlling etc.
I don,t think you should stay quiet-I don't think you have gone on and on ad nauseum just brought up the subject at various times.
I do think IMO you have to decide what it is you want and what it is you are not prepared to accept.
Are you willing to have your H home at any cost ie sharing him with his mistress and her living in the apartment--if he can be intimate with you also?(not as daft as it sounds works for some)
Do you want intimacy and your H fuly committed to your marriage and NO contact AT ALL with the OW?
Do you just want OW out of the apartment?
Do you just want intimacy?
Do you just want to be happy,contented and at peace with your life?
Do you want to feel valued and a whole person who is shown love and respect by your husband and or others?
Lots of choices,some more complicated than others. ALL requiring effort on your part and a total committment to follow through bringing them about.
Get that pen and paper out make a list of things you will put up with and things you definately can't/won't.
DECIDE for and against-your choice-no one is judging you.Once you have a clear decision then make another list of how you will proceed to bring it about.
This is your list, what H says or does is not important at this point.
You have the power, you have a choice. List,decide and then DO.
Anything has got to be 100% better than continuing in this self imposed limbo.
I know you think its all conditional on what H does and that is what is keeping you in limboland. He is making his choices,his actions tell you that.
I know you are at the point were you can make yours.
God Bless YOU and he will.