Apology Letters to Friend.
Forgetting a Birthday and Late Contact

I'm so sorry I missed your birthday and then waited a week to reach out. I know that letting the day go by without a message and only getting in touch days later likely felt like I didn't care, and I regret making you feel unimportant. I take full responsibility — I forgot, and I compounded it by not apologizing right away. That was thoughtless on my part. You matter to me, and I should have shown up for you on your day, even if it was just a quick text or call. I understand this might have hurt or disappointed you, especially if you were hoping I'd remember. I don't want to minimize that or offer explanations that dodge responsibility. I messed up, and I'm sorry. To make it right, I want to celebrate you properly: let me take you out for coffee or dinner, bring over something you love, or schedule a time that works for you to hang out — whatever would feel meaningful to you. Going forward I'll put birthdays and important dates in my calendar with reminders so this doesn't happen again, and I'll check in more consistently. I value our friendship and want to rebuild any trust I damaged. When you're ready, I'd like to hear how you feel about this and what would help. No pressure — take the time you need, and I’m here when you want to talk or plan something.