i have to agree, you have to be the strong one here..................... dont go down any pit of thinking its all because he doesnt love you etc etc................... focus on him......
He is struggling and i think for the next few weeks, you do everything you can to make his life easy , anything and everything that you can possibly do that would take presuure off him.
and you dont question anything he does, if he is cracking he may do some things that you would not expect, things to give him that space he craves to sort his head out....................
for this period he is the important person and if possible all focus should be on getting him thru this, because at the end, regardless of what happens, you will feel better if you can honestly say to your self that you did contribute to that stress and did everything you could to help.........................
good luck