I know you probably don't want to, but I think you should remove all temptation to see him on Facebook. Delete that other account and plan on never going back. You have to look to the future, especially if you want to meet someone new!
Try reading some books on relationships and I'll bet you'll see a few good reasons why you should be happy it didn't work out. Stop thinking the break up was all your fault, there are two sides to every story. You will meet someone who loves YOU for you. Take your life back and do it soon. Good luck and big hugs!