Remember the good
Some people talk about moving on like it is easy. They think that it is easy to forget about someone. When you really care about someone it isn't so easy.
If you are moving on from someone you shouldn't forget them. Why would you want to forget about the person who made you smile and made you feel special when other guys wouldn't give you the time of day?
If you talk bad about a guy then that guy is not the one for you. Remember the good times you had with someone. Be thankful that you got to have those good times with them and in the future you will find the person that is right for you.