Einstein
Temporal Engineer
I was just being an honest realist.
But if you want a speculation. Here goes. You get lucky and find out someone is willing to give you a one way trip to the past to correct something. You take the offer. You manage to save your fiance from getting run over by a car. One more problem exists. The other you. Yes there are now two of you. Which one gets the fiance? Would you cease to exist if you kill your younger self? It looks like you are still screwed.
But if you want a speculation. Here goes. You get lucky and find out someone is willing to give you a one way trip to the past to correct something. You take the offer. You manage to save your fiance from getting run over by a car. One more problem exists. The other you. Yes there are now two of you. Which one gets the fiance? Would you cease to exist if you kill your younger self? It looks like you are still screwed.