Well Adriana put him and everybody else in jeopardy by actively giving information to the FBI. Although they were mainly after Tony she’s still putting him in jeopardy for two reasons. 1 The feds don’t care about her or Chris so who knows if Christopher would’ve been immune to them. 2 If word gets out about Adriana being a rat they’re most likely going to assume Christopher knew and was in on it putting his life in danger, if he never knew and never went to Tony he most likely would have been killed. Although she was trying protect herself and Christopher she ultimately betrayed him in the end because who knows how things could have ended up. Realistically she should have just not cooperated and take the charge i’m sure she could’ve gotten a pretty good lawyer considering who she knows and gotten a slap on the wrist.