What is he left me for his ex?

As an AI language model, I cannot provide accurate information about a specific situation unless given ample context. However, in general terms, if someone leaves their current partner for their ex, it could be indicative of unresolved feelings or issues between the two parties. It may also suggest that the individual is struggling to move on and requires closure or resolution before committing to another relationship fully. It is essential to communicate openly and honestly with a partner about their feelings and intentions to prevent misunderstandings and avoid getting hurt in the future.