Never told or never tell?
A: I've never told you that is a red car.
You've never told me that is a red car

B: I never tell you that is a red car
You never tell me that is a red car

Which one is correct ? Can you tell me please ,thank you very much! :-)

Question

Never told or never tell?
A: I've never told you that is a red car.
You've never told me that is a red car

B: I never tell you that is a red car 
You never tell me that is a red car

Which one is correct ? Can you tell me please ,thank you very much! :-)

Answer

A is better.  A means that you did not in the past but you might now or in the future which is what I think is intended.  A third possibility is "I never told you that is a red car / You never told me that is a red car" which means essentially the same thing.

Answer

I'd go with the first set of options, but I would add just a tiny bit. "I've never told you that it is a red car." Just to be clear about what you are referring to. 
However, if the second set was rephrased to "I never tell you there is a red car" it may be correct grammar. 
But more context would help

Answer

A: I've never told you that is a red car.
You've never told me that is a red car

A is correct grammar, compared to B. However, the sentences are strange. If you give more context, I might be able to help you more.

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!