Search Results: ideas for a guys birthday

So, about a year ago was my 21st birthday. Me, my best mate and a gang of friends went out and I was bought drink after drunk, generally got very drunk. I needed help walking to the car (I'd been a fireball whiskey...) and was happily drunk and grateful.
We were staying at my friends flat, and long story short... Me and a friend slept together. It was just a one night thing, we are both still friends and we both have partners since then. No hard feelings, drunken mishap.

Anyway. Since that night me and my best friend haven't spoken. I cleaned her flat top to bottom, and I did apologise but she didn't speak to me. The only contact I had was her asking for her flat key back. She deleted me from Facebook.
Even when I took her key back, I left a note.

Last night my ex best friend had her first baby. I really wanna congratulate her but I don't know if it's a good idea. I miss talking to her but I don't know why she won't speak to me?
A bit of context, before she was with her current partner she used to sleep with a new guy every night for a year, sometimes more than one. Her other friends have had sex in her flat before, and I scrubbed it clean unlike her other friends. I know what I did what was wrong, but I don't know how to make it right? It's not the sort of thing I do either, it was literally drunken relaxation.

Should I congratulate her or not? Should I send her a message on Facebook or post a note through her door?