It's the BF apology thread.
No need to explain. They know what you did. YOU know what you did. Just let them know, "Hey, I screwed up. I'm sorry. Will you forgive me?"
Heck you don't even need to name names.
For instance; Here's mine:
Remember that one time I jumped on you? Yeah, well I took you the wrong way. I'm sorry. Forgive me?