Just keep busy. I'm sure your boyfriend don't want you to be miserable and missing him every minute. Find something that you like to do. Take up reading or something..
Keep busy :) School, work. gym.. whatever you need to do. Staying busy throughout the day until it is night time. Just stay on the go! Then you have gotten through another day. Nights are the worse but at least it is the end of another day! :) It will get easier!