A story about my oldest and best friend

I have a best friend. Her name is Nhi. She 's 25 years old now. She had has got married and she has no children. We were close friends for 15 years ago (FOR 15 years OR 15 years AGO). Her house is near my house. We went to school together and we did homework together. She helped me did with social subjects and I helped her did  with natural subjects. 

She is beautiful. She was the beauty of the class. She's friendly, funny, enthusiatic and sociable. In the class, many boy friends liked her (she was very popular with the boys). They sent a letter by hand to her and they asked for me to help them. I agreeded. I was happy because I was good paid paid well including fruit, lollipops and candy.

We shared everything with each other everything. When I was in 11th grade, we had a misunderstanding .I feft felt uncomfortable when we told (argued with?) each other. One day. We went out with some friends by on our bicycles. i and she She and I rode  different bicycles. When whe we rode through (or over?) a brigde bridge and suddenly her she couldn't brake and she had an accident. At the moment I was so scared, I was afaid of losing her and I feft felt so selfish. It's really stupid.
when we even treated each other like that. after After we had treated each other like that then we had to make it up with to each other. we got close. and we became close again. After we graduated from high school we studied the at different universities. We got little have less time to meet and talk to each other. But we would meet and talk if when we had have time. I hope our friendship will last.