Sometimes in life, you don't want to forget a person, but you don't want to remember them either. It's tough, I know. I've found that the easiest way is to think of them like a photograph. Think of them in the best light you can, and take a mental picture of that moment. Keep that picture with you for as long as you live. No matter what that person has done to you, when you finally cut him or her out of your life, there's no going back. The most you can do is keep that person in your mind in the best light. As morbid as it sounds, think of them as if they had died when you stopped talking. There is nothing you can do to bring them back, you still feel for them, and all you can do is move on and remember them the best you can.

I hope this helps.