What does it mean when a guy says it's complicated?

babybreath13
My guy friend is with this girl however when ever I ask or his best guy friend "how things are going between them." All he says "it's complicated," then right away drops the subject. I don't understand how it can be because he spends all his free times with her and all his other friends like whatever she says on his Facebook wall. Is he hiding something? Is it the fact that she is leaving to school this fall as well? I just don't get it. Can you please explain what it means?

PS: His best friend thinks she and him are just friends with benefits. Could that make things complicated?
What does it mean when a guy says it's complicated?
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