It can be easy to say, get over him. But I am currently in the same situation so here is what I have been doing:
I have been distracting myself. Meeting up with old friends. Spending more time on my studies. Finding new music and films to watch.
I have been blogging about my experiences of life at the moment talking about my studies and
I have been reading in order to immerse myself into someone else's life. I would suggest the author Harlen Coben.
I have been listing the positives of the breakup. Like going to Uni without a burden. No need for a constant worry.
Most of all. Take this time for looking after yourself and finding who you truly are without the worry of a significant other.
It has been two weeks and, although he may still be on my mind, I feel a lot better than I have done in a while.
Remember that he is an individual who didn't even have the manner to dump you face to face.
Then decide to focus on whatever makes you happy and move forward with your life without him.
If you can't get cancel/get a refund on the tickets, you might want to consider donating yours to charity and letting him use his.
Just because seems to show limited consideration for other people, doesn't mean that you should stoop to that level of poor manners.
My ex did this to me. He couldnt even dump you by face, thats not someone you wanna be with, I know it is had now, but whenever you start to feel sad, remember that he obviously didnt value you, or your relationship enough to do the decent thing and talk to you. As for the tickets, personally I wouldnt bother with them unless they were expensive because it is just another opportunity when maybe you are missing him to contact him, and the easiest way to get over someone is to basically, go cold turkey