erm I think the ooposite: this might the the arc where we can see the real hazuki and real character development.
Kindly look at this topic (●'◡'●)ﾉ :
https://www.mangago.zone/home/mangatopic/15506979/
yes from our perspective as readers it would seem that way, but do try to take into consideration the accumulated stress and insecurities Hazuki has had since the start, or since they had Minato (dude was really struggling to be a likable dad), or him trying so hard to make sure Naoto always live in comfort and happiness. personally it's so real of Hazuki, in his moment of insecurity and jealousy, to bring up Naoto's own insecurity. i've been an unwilling witness to irl couple fights and that kind of shit happens coz they're too caught up in their ugly emotions to stop and think that they'd hurt the other person with their words. oh and don't get me wrong, i'm not fending for Hazuki either, Naoto had every right to say that he's acting like a child so i hope they have a talk about it soon...
this sudden outburst was very abrupt, and unwarranted. it was very out of character for haruki. we've followed the two since vol1 & yes haruki is very jealous and possessive when it comes to naoto san, but he has never NEVER indicated any sort of funny regarding naoto's SA. He has been mature and a rock for the family, and only pushed naoto forward. they've had 3children, so bringing naoto's insecurity into their squabble was very very VERY low, and not like him.
it felt to me like the author wanted this arc to be nudged and supposedly out and about, but then again it was so very not weaved in with haruki's character arc. it feels like the author has put a dent in their relationship which will forever stay, & can never be resolved completely. it left a bitter taste in our mouths as well. dunno what is to come & how this will be resolved but i just want my babies to be happy.