You read it correctly, I really asked you to tell your ex Thank You. Call them up, send them a text, drop an email, thank them for treating you poorly, cheating, not being honest etc. Sound crazy? Not really. Think about it, you went through hell with that person, perhaps you dated a woman who never had time for you, preferred hanging in the club to taking care of her man. Or perhaps you are a woman who had to deal with someone who wanted to hang with his boys or lay on your couch all day, failing to give you the time or attention you needed. Thank them anyway.
Thank them for teaching you what you will not allow, for teaching you how you want and deserve to be treated. Of course the key is that you have learned from the experience and you are making changes in the type of people you allow in your life next time. Besides, having experienced someone who treats you poorly will increase your appreciation for someone who treats you well and prevent you from taking them for granted.