First, carefully describe your beautiful memories on the letter, and then talk about your feelings, pain, etc. about not being with her in the past six months. What you think can move her. Write everything down, then say something apologetic and ask her to forgive herself. Make friends to help you think about her in private. Ask your friend to tell her in private that you have missed her every day for the past six months and what you have done for her. See if she will be moved and forgive you. If possible, find a place to meet up with two people to chat. Let's have a good chat first if we can do it peacefully.