oh my dear, that must be so confusing for you: on the one hand you have all these bad memories, but on the other hand he is your Dad. You don't have to do anything that you don't want to, you don't have to see him if you don't want to. Try to remember though, that your mum might be upset - after all, they were married, and she may have memories of happy times that you don't share.
If you don't want to see him, but at the same time feel that you need to say good-bye in some way, then you might consider writing to him. However, no-one expects you to do anything or to pretend to feel anything that you don't, hugs Judith xxx