Because I'm waiting to talk to you. I can't know for sure how long I will go to your appropriate should wait is too complicated?, and if you can't, I'm taking the time to explain. I wouldn't ask you.
I was waiting to talk to you. I do not know where you are going, how long should I wait forever. If you are too busy and can not take the time to explain mine. Next, I would not ask you.
Because I"m waiting to talk to you. I don"t know how long will you be gone I should wait? And if you"re too busy not taking the time to explain to me, I will not ask you.