Your going to have to let him contact you now, if he wants to give it one more try.
He is realising that he is not your #1 priority and it can be hard to come to terms with that realisation. He is asking himself why he is bothering to persue this relationship, weighing up the pro’s and con’s, using his head rather than his heart.
I know you would like to stay friends with him, but be honest with yourself, where to from there? Will your “friendship” prevent you both from moving on to a happier place?
Take the time to examine your own priorities, it’s hard, I know.