Responses
yes! he's incredibly insecure with himself and it's been building up for a while. Hazuki hearing Naoto say that (especially after last chapter where they joke about hazuki's parenting skills) definitely was the final straw for Hazuki.
Not defending hazuki but I think what really set him off was hearing that the other guy is good with kids, like he wants to do so much for his family especially naoto but he can barely have to little ones stay with him