And prepare yourself ...I know you mentioned several times "no OW"...I said the same thing...actually many of us have...and for your sake I truly hope that is the case...but my biggest shock was not my H saying he was done and leaving...it was several months later finding out there really was an OW!!!
Aside from that...make what changes you feel are good for you as a person...become the best person you can be...H and I did the MC thing but like yours, he wasn't ready...eventually he moved away and then after about 18 months apart with me working like crazy to become someone that "anyone" would want to be with...he came back to town and eventually we rekindled things...I won't say it was like before because like you again...I was 15 when we met and I don't want to go back...but I have learned how a new me is really better for everyone...and the me I am now I am very happy with...I don't feel I did this for H...but I did it for me...
Hang in there...this could be MLC...and if so it will likely get worse before it gets better...