You were in love..with Mahito, the cursed spirit. Even tho you were a jujustu sorcerer. You knew almost everything about him , when he didn't even know your existence because you didn't fight special curses like him.

The reason you loved him? Unknown..but you did and it was genuine. So when you saw him fighting Gojo and almost dying as he was passed out you begged Gojo to let him live and he aggreed .

So now you are in your room with him sleeping on your bed, with his wounds treated by you.