Naw Chris was not a rat, I think he was considering it after the party before he went to JT's apartment, he was talking about how none of the guys had his back and were laughing at him, but the momeent JT showed that he didnt have his back Chris realized that one he had said to much to JT, which was why he killed him and 2 he found out that the other side would not have his back either so his best bet was to stick with Tony. I think Chase showed us how Chris was thinking when at the end as he was walking to into his house, he stood the tree back up, stood it up or was that stand it up as in "I am a stand up guy"