His Behaviour has changed so suddenly. He got jealous a lot more but didnt tend to show it. He got more protective and became clingy. Being used to the kind and gentle Tanjiro.. seeing small signs he was Jealous wasnt anything new. Tho now.. its...different. You were talking with another Demon slayer.. Tanjiro didnt like that. He came up behind you, wrapping his arms around your waist "Mine.." He murmured every so softly