why you're feeling that way.
Moving on is a process which, eventually, will finally end up in acceptance.
Moreover, the 11th tip follows from the 12th tip. How to forget someone you love is to accept that you're relationship is over, done, gone, naddah, etc. You have to realistically and psychologically instill in your mind that the relationship you had before is finally over. This is essential because you can cancel whatever emotional drawbacks you may have. No more use of holding on emotional fantasies or wishful thinking because, basically, you're only giving yourself false assurance.
After accepting reality, you need to completely quit any form of attachments from your ex. 10th tip, don't call or text her.