@Mr_1RaE this chapter shows although he has the memories and such, he's still a kid. Cuz as an adult I doubt he'd ever say something like that, he was just being a dumb kid showing off cuz emotions and stuff. Also as a kid, his brain is not fully developed whether he can remember his past life or not, so he is still technically undeveloped whether he's different now or not. Google brain development and how it relates to natural behavior. He doesn't have a fully developed prefrontal cortex.
Hes also not trying to bone her and hasn't been like checking her out sexually, he just wants her love. Right now I judge him innocent and just wanting his wife again. I think he'll do the right things.