Depends on the thing you apologize for

Face 2 face, 1.Tell her you love her 2.You are sorry 3.It won't happen again

Just in case she is not your girlfriend, Text or Call isn't such a bad thing either. Tell her 1. I was overwhelmed i didn't know what i was saying/doing. 2. ( Admit youre an asshole) I'm so sorry i will make it up to you. 3. (Compliment her, "you're a consistent, keeper, strong, beautiful woman always remember that") 4. I made a mistake i hope you'll forgive me This works for me all the time it never failed🤷‍♀

Baby, I'm so sorry, you know how much I love you and how much I care for you, I'd lose my whole world heck my only life then to lose you by making you this mad, honey baby trust me I'll never do this again, I swear to you on my Nana's grave. And give her whatever kind of present you bought her