I think he's being self-centered yes, but when you are insecure and feeling ashamed about your own situation it's hard to see past your own issues. I mean you see this type of behavior with NEETs from mangas all the time, now amplify that with also feeling like a burden to someone else.
I guess you could argue that he should just be confident in himself but having a career IS a big part of empowerment/independence for people as young adults. And given that we've seen him in several chapters looking for jobs and even asking friends, it's not like he isn't trying. It's understandable for him to be frustrated.
That said, it's not really an excuse to take out these negative feelings on his boyfriend. They are his own insecurities and its something he should communicate with others about. But IDK, I don't hate or dislike him as a character, he's pretty neutral atm imo.
That said, I'm expecting it to get worse and he could jump the shark and do something completely dumb and inexcusable later so who knows.
Oh i see, now I'm looking from another perspective. Thanks for explaining for the extent you're making the whole paragraphs to get it elaborate! （/TДT)/
Manhwa*
I'm sorry am i weird that i don't really like minty? I mean he's basically mixed up with his boyfie's professional and personal life. I also don't want to be bothered when I'm working. And chill yo, that's just his senior helping your boyfriend.
Andd he's not being grateful for such a kind boyfriend with stable job that can support himself.