my favourite teacher is leaving this July, any advice?

Understanding your feelings for someone else is so difficult when you are right in the middle of it. You have found someone you have felt a real bond with. That is a good thing to have and with a tutor. It means you will listen and absorb the knowledge that they wants to impart to you. For the months that this has been, I am sure it has been wonderful. But teaching is transient and teachers can and do move on. Teaching has a beginning and an end, always.
The teaching relationship has to be a professional one, it too has a beginning and an end. So how do you cope with the feelings of being abandoned?

Hold onto all the amazing qualities that your teacher had and imparted. Consider why they were so important to you? What have you learned from the short time you knew her? What have you learned about yourself? You will never lose what you have experienced, but you can grow and gain more experiences just like those as you go forward in life. This is just the beginning of your life relationship portfolio. Sometimes teachers can shine a light on the very things we have never had or experienced and that is a wonderful moment when we find them. It is like being released. You might think you will never ever find someone like her ever again. Oh yes you will. Sometimes it can be when you least expect it. Someone really important can appear in the right here, right now at any moment in our lives. Understanding that some relationships have to have boundaries and all of our relationships have an eventual end. That is part of the learning process in life. Of coping with love and loss. We never own anyone we merely have the privilege of sharing a beautiful mind.

Teachers have one of the hardest jobs in the world. They have to maintain professional boundaries for their own safety (and for yours too) Your teacher will be aware that you are very emotionally attached to her, but also aware that she has the capacity to be able to reach out to you and teach you well. She will have been very careful to keep you safe by making sure she maintains her professional role. She will not be able to stay in touch with you when she leaves. Your personal connection with her will have an end when she leaves. Believe that after she has left you, that your teacher (this shining star) will continue to impart her love of teaching and patience on other souls. Others who will no doubt benefit from her love of teaching just like you. Use what you have learnt wisely.

Life will seem very dull for a while, but you have had the honour and the privilege to have spent time with her. Hold that close and now take what she taught you and run with it - which is what you would have done if she had never left. Believe in yourself and to know that you can succeed. That is your teacher's legacy and yours to know and take forward in your life. This time in your life is just the start of finding and exploring more interesting relationships, some will be good ones, and some bad. Hold onto the laughter, and grow the wrinkles around your eyes.