Sounds like you wrongly assumed the speed that the Golf would travel at and that he never actually stopped accelerating rather than sped up to stop you getting past.
Personally I never start an overtake without seeing a perfectly clear space between where I am and where I know I can safely pull back in with at least the same distance again to allow for cars coming in the other direction.
Personally I never start an overtake without seeing a perfectly clear space between where I am and where I know I can safely pull back in with at least the same distance again to allow for cars coming in the other direction.