[Your Name, & Address here]
[Recipient Name & address here]
I am really feeling sorry that I have not written you since a long time.
Wish there was a great excuse in my mind, but the truth is that I am so busy in my hectic life schedule. And, I really don’t get time for keeping in touch with any of my friends. I hope you forgive me.
So, what new things happened to you during this time? I want to know everything you did during the last couple of months.
Thanks for your understanding me. I look forward for your reply.
Take care, good bye.