Alright.
Again with the 5 Love Languages. Read this book.
Saying "I'm sorry" is only meaningful to people who are words of affirmation types (primarily vocal communicators).
For acts of service types the best apology is doing things for them. For people who need gifts that's the best way to say sorry, for quality time people that's what they need and so on.
Get this book. Read this book.
The Heart Of The Five Love Languages By Gary Chapman - eBook - Kobo
Note: This book is made for married couples. Ignore all that. The important part IMO is explaining the way different modes of communication need to be treated and where you have problems when you can't identify the language of your partner.