The guy rejected her request for sex on Christmas Eve in name of some stupid pride-driven form of grandstanding ("We'll do it when I will be the one who moves forward") , left her hanging for more than three months since then at this point of the story and he's stuck in a limbo of cowardice and indecisiveness.
Let's say it again: Tatsu refused an explicit request for sex from Konoka, the girl he's in a formal relationship with and lived and slept together with for months, and then left her waiting few more months on top of that.
AND PEOPLE HERE ARE MAD AT THE GIRL FOR "MAKING THINGS DIFFICULT FOR HIM". Un-fucking-believable.
You guys should just be thankful that this is a fluffy and unrealistic setup to begin with, otherwise his behavior in any other scenario would pretty much equate to submitting a formal request to activate the netorare subplot.
We aren't even talking about the tame variant where she'd go "doki doki" on a love rival. We are talking fucking a random guy in a bar to relieve her sexual frustration.