Hey, (имя друга/подруги). You probably don't want to speak to me. I understand. I just want to say I'm sorry I missed your birthday party. I couldn’t come because I didn’t have any new cool clothes. I knew that David was also invited to your party and you know how much I like him… I'm sorry for being such a terrible friend. I feel embarrassed and ashamed. By the way, how was the party? I hope you had fun and received a lot of cool presents. Talking about presents, I’m sorry that my present for you is still with me at home, so tell me if you want to see me this week. I’d be glad to give it to you, at last. Once again – I’m sorry, so sorry…Please, forgive me. You know you are my best friend and I love you very much.
Вот, удачи)
Вроде правильно xD