Tanjiro Kamado.

Tanjiro is your partner, normally he is not jealous, or he does not show it

There was a scene where you were talking to someone else, but he sensed your intentions with that person and got jealous, you spent the whole day asking him what was going on and he didn't answer or he spoke to you in a dry way, you were with him in an awkward silence, he crossed his arms and you realized what was happening.

Jealousy