Jirou was an ordinary guy who got friendzoned by his childhood friend into the loss of his confidence (BTW, lol @ that guy still trying to laud Shiori at Akari's expense even at this point...you get an A for consistency if nothing else); the ensuing heartbreak was so profound, it turned him into a loser--but he still had the potential to become a proper man, which he does...though he mostly had to do it himself. Akari was the impetus for his change toward better, but also a light that helped him see the right way toward that end--even if it wasn't a comfortable road. That light helped him move on from the events of the past that crippled him--even though the central spectre of that past returned with hopes of keeping him right where he was.
Tenjin, on the other hand, was a guy coming from--apparently--a family that was at least well-off; he received a solid upbringing from childhood that led to his much-lauded character. In this childhood, however, Tenjin had fallen for his tutor--and was rejected the hard way at least twice: via the tutor's revelation that she was engaged to his brother; via her direct, strongly negative rejection of him; and via his witnessing her sexual relations with Tenjin's brother. These wrecked Tenjin, but--unlike Jirou--Tenjin's psychological damage was kept internal due to his upbringing toward becoming a successful member of society; perhaps that damage--and the resultant deterioration--was limited by his strong work ethic and his focus on work therefrom, as well. His decline might have been limited by the universal praise of his peers--but that probably didn't mean much to that damage; what didn't help said damage was surely (as one could see in this chapter) his family's disproportionate focus on the collective (society, and one's place in it) over the individual. As a result, Tenjin was built with a great foundation--already a respectable and respected man, ready to become the same in society--but he, because of his trauma, was a superficially flawless building with gradually failing structural integrity; neither his peers (who were awed by his moral excellence) nor his family (who were only concerned, for the most part, with doing as society expected and producing for that society) could see past the exterior of that building.
Jirou was instantaneously brought down to nothing from ordinary by a girl of his past, and made his way back up to respectability largely alone--with his eyes on another girl that is shaping up to be his future.
Tenjin was raised to be extraordinary by such an upbringing, but was gradually being eaten away from the inside out by a girl of his past, with almost everyone around him blind to the fact that it was happening; he's still alone in dealing with it, and has no one to help keep that girl's memory out of the unoccupied spaces he may see when he looks ahead. All Tenjin really has, for the most part, is his state as a soon-to-be high-quality member of society.