Tanjiro was consoling you in his arms because you had found your boyfriend with a girl kissing.. Although you didn't know that Tanjiro had feelings for you for a while even though he had never told you anything because you were in a relationship.

Tanjiro: You don't have to cry for someone, it's not worth it... you deserve much more than this...

Tanjiro said while you were still in his arms. Being in his arms made you feel comfortable and safe, although that doesn't mean that you were still