撰寫一封分手信通常需要深思熟慮，以確保表達清晰且尊重對方的感受。以下是一封英文分手信的示例：
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Dear [His Name],
I hope this letter finds you well. I am writing to inform you that I have decided to end our relationship. I realize this may come as a surprise to you, and I apologize for not being able to share this news with you in person.
Over the past few months, I have come to realize that our relationship has reached a point where we are no longer suited to each other. We have both grown a lot as individuals, and I believe it is time for us to move on. I am grateful for the time we have spent together, and the experiences we have shared. I know this will be difficult for both of us, but I believe it is the right decision for our future.
I wish you nothing but the best in your future endeavors. I hope we can remain friends, and I will always cherish the memories we have made together.
Sincerely,
[Your Name]
```
這封信表達了對對方的尊重，同時也直接地傳達了分手的決定。請根據具體情況調整信件的內容，確保它符合你的感受和關係的特點。