I am not 100% sure with the translations that I have posted, please do correct me if you notice something grammatically wrong with these answers. Thank you.
I really don't know what to do. - 정말 어떻게해야할지 모르겠어요.
Thanks for the time you spent with me - 당신이 나와 함께 보낸 시간에 감사드립니다
Until next time - 다음 시간까지
You don't have to say sorry - 자기가 미안 말 안해도 돼
Thanks for the time you spent for me - 나를 위해 보낸 시간에 감사드립니다