Yes time travel spell maybe cool for a tv show or movie, but it's never ok to mess with time in reality. Messing with time in the past, will leave to bad results in the future. example like keeping your parents from seeing each other in the past, can led to a future where you were never born. So that is why you should just leave time alone in general. You also can't go back in time to fix a past mistake you made, you have to leave with time moving forwards. Which is why it's better just to leave time alone, like I it may look good in a tv show or movie, but it's never ever ok to mess with time in reality just leave time alone what happened in the past stays in the past you can't change the past you have to move on and learn from your mistakes. Always live with time moving forwards no matter what happened in the past.