I don't normally post in the SE section, but I swear, so many people are losing their account passwords. Tried the email reset? If that doesn't work, it could've been hacked. Did you use a secure password that you'd remember? I really don't know what to say. :|
Sorry man. :C
There're a lot of people who go around claiming to hand out "free membership" and ask for people's passwords. A lot of people who play this game are on the younger end of the scale and thus lack some common sense about it. On the other side of the spectrum some people ask to "borrow" your account with membership, which may have been the case here. Alternatively, if it was a shared account someone else might have been loose-lipped about his password. Or, maxchiang. lol
In short, never willingly give away your password. We moderators CAN'T do anything about that.