First of all don't take any decision in anger. When you feel bad about it cry louder as possible you can, by this you feel better. If you want to forget him, do some imagination like, you meet him and kill, his body blast and dissappear, make his face funny, his voice, repeat many times. But I suggest you to bringing up because, 2 years relationship is not a joke. I don't suggest you to make him boyfriend again. Make him a good friend. You won't destroy negativity but you will make negativity into positivity.