I agree with most everyone's thoughts here. You need to step back and let him come to you. You've said all you could say, and at this point, the ball is in his court. He is probably going through a really difficult time, and may have pushed you away because he has too much going on emotionally right now. All you can do for now is move your focus onto your own life and hope that he finds some clarity when all the dust has settled.

He may get in touch with you after his mom dies because he needs someone to talk to, he may get in touch with you in 6 months, or maybe never. But the longer you "wait" for him, the worse off you'll be, thinking of what could have been, what he's doing, or why he hasn't contacted you.

I think you should just back off completely— don't text him or push to talk to him. If you matter to him, he'll come looking for you.

Good luck hun