I have a crush on RG, not you. Can you understand that much?
Is that right.  I'm not sure I know who RG is, though.  Why do you bring this up?
Because I know you have a crush on me.
I'm not sure who told you that, but it's perfectly fine with me if you have a crush on someone else.
I won't sleep with RG, I just want to be his friend.
Have a crush on whoever you want to. If you think I have a crush on you then you might be mistaken though. Try not to assume things that aren't true, because one day that will be worse than just a light conversation.