the guy is a douche but I can guess his logic. The way he treated her when they were together(before the break up) and how desperate he is to get back together makes me think he genuinely likes her. From this I believe he ended it the way he did because he believes that chasing his career will only make her suffer if they continue the relationship. He ended it harshly so she wouldn't hang on to him. Though that's just my take away from it since if he was a genuine asshole she probably wouldn't have fallen that hard for him. Of course, none of that logic excuses what he did and it certainly doesn't justify him trying to squirm back into her life.