Every Possibility has to be Realised

If every possibility has to be realised, then whatever you are experiencing is a possibility that had to be realised in this world or another, no matter how small the chance. The only thing to be done is to confront and deal with the situation effectively. 

All Possibilities

If all possibilities actually exist (parallel universes), then the notion of fairness and optimality simply dissolves. If all paths and decisions that can be made are actually made , there is no sense in worrying about the future or having regrets about the past. One can simply become fully present to the potentiality of what can be manifested in this present moment.