Like the film, life is full of Sliding Doors... the ending is already mapped out for each of us but its how we get there that can vary depending on the choices we make along the way.
But the choices we have available wouldn't be there if they weren't meant to be. If something's not possible, we're not given that choice.
Good and bad events happen depending on the route we choose to take. Every decision we make has a 'good' and 'bad' option. If we take the apparently easy, short cut, nice option, bad things happen along the way and if we take the long, arduous, challenging route we'll be rewarded with good along the way to keep the balance.
So does it really matter what we decide about anything? If the ending is the same it's the quality of life that matters. If the 'enjoyable' path will bring hard times and the 'arduous' path will bring happiness...
Which direction will you choose...?
Or do you have a different theory?