"T, I'm sorry, it's Okey as long as you are happy. I do not care whether I'm sad or not..."
T, sorry, it is OK for you to be happy whatever I am sad.
I'm sorry. It doesn't matter whether I'm sad or not as long as you are happy.
T, sorry, as long as you just happy, I am difficult not upset doesn't matter
Sorry,T ,as long as you are happy ,it will be fine. I don;t care about my own sadness