Who is my best friend?

I have a lot of many friends, but and of them he one of these is my best friend, named Angel. She is very very generous and a sentimental a person who always help me. When I was age of 15, I take an illness with my had kidneys problems. Then, I was searching someone, for a donor who can help me for my disease. Guess who helped me? what do you think? It was, of course, my best clever friend! like Angels helped me, She gave me donated one of her one kidneys to me. This is my the best friend of bests, She is the bestest 1 of the best.  By the way, I love will always love you, my friend, forever. We stay always good remain the best of friends in the this life. I will be also your best friend, until depart this my life. until death do us part.

1.  There is no such word as "bestest" in proper English.  I am using slang to convey how you feel.  In this case, it is most suitable.

Who is my best friend?

I have many friends, and the one of them is my best friend, Angel. She is very generous, sentimental a person who always help me. when I was 15 of age, I have kidney problems. I was searching for a donor. Guess who helped me? It was, of course, my best friend. She donated me one of her kidneys. She is one of the best of all my friends. By the way, I will always love you, my friend, forever. We remain the best of friends in this life, until death do us part.