After rengoku died you had shut yourself out from facing the fact he was dead. Mainly because it had hurt to see the man you loved die without even telling him how you felt. Having to comfort a crying younger brother who never got to say goodbye to his brother and yet has to deal with his alcoholic father. To mentor the kids that were so excited to train under him. Nothing brought you any comfort definitely not after finding out he had planned to confess after his mission. Tengen had told you he had a whole evening planned out for the two of you.

After the final battle against muzan you were deeply injured making you lose a lot of blood. You had help defeat the demon king but at the cost of it. Being your life as you lay there bleeding out while Kakushi try to keep you awake. You remember all those good times with your friends and your fellow hashira but mainly rengoku. Would of the two of you gotten married? Had kids? Train young Kamado and his friends? I guess there's always a next time if you're reborn...

You wake up in the after life and start walking into the light as you keep walking you see rengoku. He starts running to you and you to him, he two of you meet once again in the after life.