I'm not saying Dan should find how he's feeling and his crash out understandable. He should be upset and demand for some communication or apology from JJK. But, you're not registering the fact that he's just stubborn to a fault. Is that a reason for him to be an ass****? Absolutely not! But, he's at an age where he has to retrain himself. Teaching an old dog new tricks is not as simple as it should be, let alone having to rewrite how your emotional processing. It quite literally DOES take time. There's no other work around with that. Man practically used his career and s** to take out his frustrations which is extremely unhealthy of course. Yet, he was able to at least start working on what he's doing wrong once he lost the person he held close without realizing. If you can't recognize that realistically, since that seems to be the creator's approach, it takes time to readjust and become accustomed to certain practices, then maybe this isn't the manhwa for you.