Lies and hope are toxic to a relationship as well as the past. If you bring up things that happened yesterday over and over again how will you ever move forward in your life with your partnership. Lying about the past to keep them content doesn't work nor does telling them the truth about it. Nobody likes when they find out or hear bad things about someone they fell in love with. Lying to yourself that your happy with how things are wont help either. To remove toxicity from life and love is to remove the past that got you to the point were you are now with the one you love... you have to have rainy days to enjoy sunny ones.