Carly Colon talks about the physical alternation that Cena and him got into. Carly said it was because Cena wanted Carly to be on the top of the roster with him and Cena didn't want to be the only guy. Carly said that Cena is really strong.
Carly also talked about how Cena wants other on the top of the roster with him, Cena doesn't want be the only top guy.
Carly also said that Cena and him are cool with each other
source: http://www.youtube.com/watch?v=VJ995mlvBN4