I am not an expert, but my H has had two MLC episodes, about 11 years apart. In his case, I felt strongly that pushing him to decide would result in him leaving.

With MLC, I really think patience gives your marriage the best chance of surviving.

Me: 44
H: 44
Kids: 20, 16, 16, and 10
Together/Married: 22 years
H announced he was emotionally detached and considering D: 4/4/16
H announced he is going to try to stay and reconnect: 5/1/16