I think Adam broke up with her. Adam said that He's very happy with the single life(star magazine). He was spotted with different girls every night. No kidding. (There's a lot of sightings of him in the internet)actually, did she broke up?
Good thing is they don't have dramas. they are still friends (according to them) Rachel talked about Adam in an interview and she said some nice things about him etc.... so, they are pretty cool with each other.
Can you relate to your character’s experience of running from a breakup?
Adam Brody: Yeah, yeah, although I fortunately have never been dropped. He gets dropped. But I’ve definitely been through some breakups. ADAM BRODY INTERVIEW
On the actual split: It was the most dignified breakup you could imagine. Neither of us left the other for anyone else, and we're still friends.
Intouch mag