Question

What is another way to say " The reason i'm asking you this because..."

Answer 1

The question is asking to state what would be another way to say the statement "The reason I'm asking you this because", in my own understanding, you would use the word "What I've said has a reason, and its...". I hope you are satisfied with my answer and feel free to ask for more 

Answer 2

The reason why I'm asking you this is because... is a grammatically incorrect sentence because you are giving a reason by using the expressions 'the reason why' and 'because.' One of these is redundant, unnecessary, and you don't need both of these expressions because they mean the same.

So, instead of saying that entire sentence, you can just say I'm asking you this because... without the first part.