<human>: I [23f] broke up with my ex boyfriend [23m] of 3 years this Spring. We left it on good terms, we were just at different places in our life and had different goals.

4 months ago, I started dating a guy [23m] I met online. We were both coming out of long previous relationships so we decided not to get too serious. We started having sex about 3 months ago and have discussed not using the boyfriend/girlfriend title at this point. We have not discussed seeing other people or becoming exclusive.

Anyway, I recently found out the new guy got a job offering on the other side of the country that he will probably take. I really like the guy and would like to continue seeing him, but I would never be able to visit him. I don't think I could handle a serious long distance relationship.

As the title says, I was out at a bar with my friends for my birthday and my ex was there (new guy wasn't). We started talking and catching up. Long story short, we had sex in his car. I know we're both clean so STIs aren't a problem. It wouldn't have happened if I had been sober. And I've since told the ex that we aren't going to hook up again or get back together. 

Should I tell the new guy about the hook up? I don't know if I would call it cheating since we never discussed being exclusive. Or am I trying to justify my actions? I know it will never happen again.

Can you give me a shortened version of the text?
<bot>: Been dating a new guy, not necessarily exclusive. Got drunk and slept with my ex. Should I tell the new guy what happened?