Yeah, I replied through my email then I saw that it had already been mentioned lol I do think he is worried and that a lot of Charly and his' conversations revolve around him wanting her to leave. He's afraid of their relationship being used against him or what Nick might do if he found out they were still going around behind everyone's back. He doesn't figure Nick's above using her for leverage and there's a good chance it would work. I'm sure he made some warm and fuzzy promise to Sam to protect her too.