His immature attitude is so painful to watch most of the time, but it actually worked pretty well in this conversation. Extremely pushy guys are the norm in shoujo, so it's nice Nao here has stated clearly his own feelings, but since Sena told him she can't view him romantically, he's not going to keep pushing directly. But he did tell her to look for someone who'd treat her fairly. Right after he had told her that he believes she should stay as she is and not hurt herself by denying her own needs for other people's sake, which is extremely fair.