Dear, winslet, I'm so very, very sorry for the pain I can literally feel you going through right now. First, I hope you're not offended, but I'm going to stop and say a prayer & come right back. I am going to say, though, you know sometimes people don't understand the very LAST thing you're thinking about is another relationship. I just feel you hurting so badly right now, but do you mind if I ask if you're a Christian? It will help me maybe be able to help you better, if I'm able to do so at all. (It doesn't matter your answer.)
Well , your mind will never let you fully forget someone... So maybe just use that past relationship as help for the next one... Not always good to forget things... but you know that is my opinion .. hope it helps a little...
Speaking from experience, you cannot ever forget your true love. However, in time you can go on and make it through all the stages of hurt, anger, remorse, regret, despair and heartache. It is not easy but it can be done. Once you have gone through all the stages you will find another, not exactly your true love, but close enough to make you question. That person will bring you happiness, and serenity and love.
You don't have to completely forget them... you can consign them to a special corner of your heart where you keep fond memories. Short of getting amnesia, you will always remember that one special someone. As long as you don't act on that memory or obsess about that person, you are doing nothing wrong (forgive me if I assume incorrectly, but I'm assuming that there is a valid reason that you need to forget them... either you or the other person is in a committed relationship). Memories are not so easily dismissed. They are sort of like house guests... the more determined you are to get rid of them, the more apt they are to stick around.