It happened me, when I was younger. unrequited love is the worst kind of love, took me 4 years to forget herOn one hand he's at the very least honest about not being interested in commited relationships, but on the other... Somehow he still comes off as trash, not sure how to pinpoint the exact reason as to why. I think it's because he doesnt reaaaally draw the line, he keeps feeding her hopes and give her all that attention
Eh, he strings her along too much. Telling her she's too good for him (and he's right) but then still flirts and plays around with her. Asshole move.honestly the only thing about Sanari that seems bad to me is that he says "I'd like you to give me props for restraining myself". like no buddy! stopping when your partner asks you to is basic human decency!
(but also, "you make me so horny i won't be able to hold myself back" is so common within romance manga as to be unremarkable.)
otherwise, Sanari knows what he wants and makes sure to communicate that to the people he talks to. not wanting to be in a relationship with the protag is not a character flaw.