Letting him know how much you appreciate him and how much he means to you is a great idea for a birthday letter. Here is an example of how you can write a birthday letter for him.
Happy birthday, my love!
I’m so grateful to have you in my life. You bring me so much happiness and joy. I feel truly blessed to be with you.
On this special day, I want to let you know how deeply I love you. You mean everything to me. I will always cherish our time together.
I hope you have a wonderful birthday surrounded by the people you love most. I’ll be thinking of you all day long.
With all my love,
{Name}
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