Traffic accident - who is at fault?

[xCptMorganx]

On sunday night my roomate and I had to switch parking spots in our driveway so I wouldnt be blocking him in for work in the morning. Basically what happened was I pulled into the street and pulled forward to straighten my car out then started backing up to get behind the driveway so I could pull in, at the same time my roomate was backing out of the driveway. We didn't file a police report and luckily there were no cops around b/c we both would have failed a breathalizer.

I told him I would pay for it b/c I thought it was my fault and I didnt want to report it to my insurance. But I've been wondering if we might each be at fault. What would you guys do? Has anyone been in a similar situation? Also I'm not sure if this matters but I was going in reverse on a one way street.

EDIT: Basically I was backing down the street and he was backing out of the driveway and we hit each other. MSPAINT coming soon...