At first when Cristina was following Owen around and was so paranoid I wasn't sure if she really had something to be worried about or not. But last episode in the last 1-2 minutes of the show we find out that Cristina was wrong...he wasn't sleeping with Summer (can't remember what her character name was) but she was right that he was cheating! I was completly and totally shocked!!!! I really didn't think he was the type. I thought he would be a lot more likely to just leave her then he would be to ever cheat.

Cristina is my favorite character, so hearing Owen say that was really upsetting (but not as upsetting as when she threw herself on him and he just pushed her away....poor Cristina)

So here's the question...WHO did he cheat with??? My guess is its just same nameless woman he picked up at a bar. I've also read some people think he cheated with Teddy during the whole Henry thing---I seriously doubt this.