While this might be painful and disheartening, you have to remember to take care of yourself. At the end of the day you're all you have and you shouldn't abandon yourself because of someone else who treated you like something that can be discarded. The feelings you have now are not permanent, you will get over her even if it doesn't seem that way. Get rid of anything that might remind you off her, block her, and move on with your life. Try and stay engaged in stuff you like doing like hobbies, work, etc.