Hmm I think in some cases, holding on to only the good can make us idealize a certain situation, relationship or time in our life to the point where we overlook the negative, and that's not healthy.
Which isn't to say I'm not a follower of the let go ethos myself :D I agree completely, let the bad shit just go. You don't have time for that in your life. <3 Thank you for this wonderful and heartfelt entry to the #KISS prompt. I really enjoyed reading it.