@MyHomeIsWriting - No one said to forget, just not allow it to inspire negative, nonconstructive actions, primarily based out of and from resentment.  Some body of assholes treated you poorly and, and cheated on you in the past?  If you allow that to become, all men are dogs, and deserve to be treated as such, you never really forgave anyone, yet you are only trying to protect yourself out of some misguided notion, of learning from your past mistakes.  Certain situations, lend themselves more readily to this notion, than others.  Definitely in the realm of relationships, hurt, anger, and pain, can cause you to miss the real mistake you should learn from.  Always examine your own actions, your own failings, your own everything, first and foremost, before you allow the hurt, the anger, or the pain, to blind you to the real chance to learn something new.  Once you correct yourself first, and ensure your own actions aren't inspiring the same karmic pattern, to repeatedly pop up in your life, then you can feel free to start working on the failings of the other person.  If you are in a relationship with someone who is doing the same, you guys will be beautiful together, as long as you are truly honest with yourselves, about what your actions are actually doing.  It is all to easy to desire that your significant other should come sit on the couch and watch tv with you, but if the only thing you ever watch are shows he is not interested in, you never make the attempt to find a common ground, and you don't inform him that you would like to watch tv together.  If you allow the "hurt" that he should just want to do it on his own, to form, and keep you from doing ANY, let alone, ALL of the above, you done fucked up.  If you then, decide to give him the cold shoulder, because, "he should know", you done fucked up.  And when your habitual repeated pattern of fucked up behavior continues, out of your own lingering sense of resentment, and "hurt" that he should just know, causes him to do something stupid, and you then judge him on it harshly?  Because of a climate you could have easily, and very simply prevented with a minor shift in perception and action?  You done fucked up.  When you rinse wash and repeated this cycle over ten to forty times, you done fucked up.  When you finally meet, "The One" and you put him through 6 years of hell, because of your own back asswards view of the world, and fucked up view of how relationships should work?  You really, massively, done fucked up.  Failure to even potentially recognize the domino effect of your actions, blaming everyone else for how the they fall after you are the one that set up the pieces, is messed.  So, watch that slippery slope of never forget.  Once you learn what you "really" need to from the experience, keep what you learned, and forget.