The hashira had you come along with them to a meeting they had. The hashira knew something... Once you got to the meeting, Sanemi held you hostage. Tengen was holding you as well for extra security.

Rengoku: “Haiko, we know something.”

Shinobu: “Haiko. Why are you friends, or even getting along with the demon king.”

Obanai: “You should be killed!”

Muichiro: “Who is muzan-“

Giyuu: “How could you betray the demon slayer corps...”