Ok, I'll bite. What revenge exactly would you envision as 'adequate' then?
Our MC saw the shit that happened and just left. However,
without that event occurring he would have
never met the women in the bar. I think we can say that with the story so far, he is VASTLY ahead of where he was prior to all that shit happening.
His life is moving in a positive direction with an upward trajectory that is exponentially better than where he would have ever been before. Why would you want to give the former asshats even
more power over you by you dwelling on them even more than the former time wasted with them around? It would be an actual step backward at this point in the story for the MC to even spend any time thinking of the ex-GF, his dad, or the ex-boss because he's about to see them in the rear view mirror as his life rockets into the upper stratosphere.
All that mental energy and emotion he would be much better served using to get his new life moving forward more, diving into his new job and making it better as well as showing everyone in the town just who he can be and what he's capable of. You don't move forward by constantly looking backward, that's when you run into trees.