Here are some heartfelt sorry messages you can use to apologize to someone:

1. “I trust fate and I believe in love, which is why I know you’ll accept my apology.”
2. “I’m sorry, I was so wrong. I don’t want to lose you in my life. Please forgive me.”
3. “I value our relationship more than I value my ego. I should have apologized way before today. I’m so sorry.” ^{lovingquotes.net 1}
4. “I will never be able to express how I feel inside. I am really sorry about everything!”
5. “I am extremely sorry for my behavior. I wish I were more careful with my words. I love you, my friend. Please accept my apology.” ^{wishesmsg.com 2}
6. “I am truly sorry for hurting your feelings; it was never my intention to cause you pain. Please forgive me for my thoughtless words; I value our friendship more than you know. I miss our good times together, and I'm sorry for letting you down; I hope we can move past this.” ^{tenorshare.com 3}