I get the feeling mister model is gonna go from incensed to furious once he realizes our MC isn't keeping secrets... he's just that dense and hasn't noticed.
Also, the guy's reaction isn't entirely invalid. Like yes, he's obviously trying to get in with Kurokawa. But if you were socializing with someone but it turned out they were in a relationship with the girl you're interested in and they said absolutely nothing, basically setting you up to make a complete fool of yourself... well, who wouldn't get just a little pissed off at the idea?