Answer: move on.
Explanation: It might be very hard for you to do this, but girl, you gotta remeber that he cheated on you. This might be harsh, but he didn't love you enough to stay loyal to you. You might have loved him but you DO NOT need him. If you really can't get over him, get into new hobbies like painting, exploring new music, cooking, and writing short stories. Make new friends or spend time with the friends and family that you may have. keep yourself busy and find stuff that makes you happy and proud of who you are. You don't need your cheating ex to be happy. You will be okay, it might take some time but I know you will be okay :)