Go no contact. Cut off any supply you might be giving him/her. If there is violence get a restraining order.. They mean nothing..could actually fuel a fire. However they will lose interest eventually or if there are consequences to their actions that are more of a burden then hurting/playing with you.
Remember the relationship YOU see is NOT the reality. Emotions are a key component. Give none. It's a very difficult and painful thing to do. Sadly I realized this far to late..
Disappear... But remember if you've been played well you must realize that going nc is a 2 way street. It will also delay your healing trying to make sence of things... Things most people cannot do...
Good luck!

Disappear quickly and quietly. Do not reason with them. This will further confuse you. Because you are only expecting