my girlfriend

Hey /mjg/, I have a very serious problem. I'm fucking crying because of how stupid I am.

Okay, so my girlfriend was supposed to come over to my house yesterday because we were going to watch a movie. She lives about 30 minutes away, so I figured "cool, I'll just play mahjong while I wait".

So I'm playing mahjong, and having a pretty miserable time. Anyway, she finally does show up, except she's crying as she walks into my room. Instead of doing the right thing by comforting her, I half-focus on my game and her. She starts telling me her cat died, and just as she was getting into it, I'm dealt a new haipai in my game.

A ryanpeikou iishanten. Holy shit. (For those of you who don't know/care, ryanpeikou in riichi mahjong have less than a 1/1,000 chance of appearing; 1/8192 to be exact.). I stare into my screen in amazement, yelling "holy shit, YES", interrupting her mid-story. She sobs more, and she starts to yell "You don't even fucking care! YOU JUST WANT TO PLAY YOUR FUCKING GAME!" I'm still looking at my screen, still focusing on getting my ryanpeikou, when she takes my mouse and starts clicking at random. I stared at the screen hoping that she didn't break my hand, and quickly noticed that she cut an essential tile. My ryanpeikou and my oorasu comeback, gone forever.

I start screaming every obscenity I know, and started flailing my arms around. I didn't know she was behind me, and apparently I backhanded her in the face while I was being a dumbass and swinging my fists around. She yells out "FUCK YOU", and runs out of my house in tears.

What have I done? I've fucked up so badly, and I need to know how to approach her. I don't want a game of mahjong to be responsible for ruining my best relationship ever. Help me, /mjg/.