Relationships? Let's see...

Rei falls in love slowly, but once he gets attached, he gets attached deeply. He has little experience with healthy love, so at first he might confuse care, attachment, and romantic feelings. He would probably take a long time to realize he's in love. To him, it would feel more like constantly thinking about someone, wanting to be around them, and worrying about their safety.

He's very jealous, but rarely shows it. Instead of starting arguments, he becomes quieter and more observant because this dude gonna start to try to find the problem in himself.

He struggles to ask for attention directly. If he misses someone or wants affection, he'd rather sit beside them and wait for them to make the first move. Once he fully trusts his partner, he becomes surprisingly affectionate. Not clingy, but always looking for small forms of physical contact like holding hands, hugging from behind, resting his head on their shoulder. It's important for him to know that he's loved because of his upbringing, he grew up seeing himself as a tool rather than a person, so genuine acceptance affects him more than any compliment ever could.

Rei feels far more emotions than he lets people see. He was raised to suppress his feelings, so he often struggles to identify and explain what he's experiencing. When he's angry, he becomes frighteningly calm but when he's sad, he tends to withdraw and barely speaks.

He rarely cries in front of other people. If he ever breaks down and cries in someone's presence, it means he trusts them almost completely.

How he shows care? Protection is Rei's primary love language, even in completely safe situations, he's constantly aware of his surroundings and potential threats.

He always walks on the side closest to the road.

Jealousy? Heck yeah

He doesn't make scenes but instead, he starts comparing himself to the other person and looking for his own shortcomings. He might genuinely believe that the person he loves deserves someone better.vOne of his biggest fears is becoming unnecessary, because of that, his jealousy tends to manifest as anxiety and insecurity rather than possessiveness.

Let's get back to his parenting life

Before meeting Miri, Rei was convinced he could never be a good parent. Taking care of her gradually helps him realize that he's capable of giving others the warmth he never received himself. He's the type of father who doesn't talk much but always shows up when he's needed.

He secretly takes photos of important moments and keeps them for years.