Has my friend been blocked from Facebook?

[Ben]

Me and Aaron used to talk all the time on Facebook chat, but one day he wasn't on my friends list, and I wasn't on his.

When we try and look for each other online we can't find each other. He can't find me, and I find his profile (with no picture) and he doesn't receive my friend request.

I then asked him for his Username and Password, so I could log into his account and look for me. When I tried to log in, it said the account was "Temporarily Unavailable".

It then asked me for answers to a security question (which I don't know).

Does anyone knows what's going on with his account? And do you know how to fix it?