He said it was because his mom got sick. That is his reason. What you don't know is how to accept that the relationship is over and that eventully, with time and how you keep busy, you will get to the stage of indifference to him and he will just be a memory that you can visit where it won't hurt you in the least.
You are not endearing yourself to him by keeping in contact with him nor are you helping yourself to get over him so stop all contact NOW. No texting, no emailing, no phone calls, no attempts to see him, no faxing, no notes being carried via carrier pidgeon.
The quicker you stop tormenting yourself with attempts to see/talk to him, the quicker you will get over him.
Good luck, you were fine before you were his gf and you will be fine after you're not. I promise. But first you have to get on with that no contact for you to start getting over him.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion