Context: I am a new student of a class. There is a friend, she has always helped me since I joined the class. Now I am still in the same class with her. I feel grateful and just want to say thank you to her.
(1) Me: Thank you for what you did for me, Jane. I hope that our friendship will last forever.
(2) Me: Thank you for what you have done for me, Jane. I hope that our friendship will last forever.
No matter if Jane keep helping me or not, I can use either tense. Right?
Any difference between them?