This could have been a very satisfactory story had the MMC been developed in depth. Instead his problematic character traits were explained away by the label “abandonment issues”. There was little in-depth exploration of those.  The third act breakup popped up without much warning thanks to those unexplained abandonment issues.  On the plus side, the FMM was well developed, the meet-cute was definitely cute and the story had all the necessary requirements: grammer, sentence structure although the plot could have been a bit meatier.