One of the great things about writing is that nothing in life is ever wasted. It can all be recycled in a story: the good, the bad, and the ugly.
For example, you get in a fight with your wife, husband, boyfriend, girlfriend. Well, it’s never pleasant, but regardless of the outcome you will have something to bury and use later. Not that you will recreate the fight exactly, but it will be buried in your compost pile (every writer has one) and when (perhaps years later) you’re writing a scene where lovers argue you will dig up moments from that old argument. Of course these moments will need to be changed to fit the story, but that will happen automatically as long as you’re true to the moment in the story. So—nothing is wasted.
IMPORTANT TIP: Never bring this fact up during or after an argument with a boyfriend, girlfriend, or spouse. Even though, when you’ve lost one of those silly arguments, you may feel like saying, “You may think you’ve won, but I’m just putting all this away to use later when I’m working on a novel. Ha.”