Yeah, that's really soon. People develop those strong feelings at different times but I still feel like one week is not truly enough time to know if you love someone. It seems like a lot of people just throw that word around when they don't really mean it, so the word just loses it's true meaning.
He really really likes you,.. and you both should be honest and open about it. I have fallen for people instantly before... they usually don't feel the same but it really boils down to he really likes you right now... and he was drunk.
It is very weird. You can not get to know someone well enough within a week to be in love with them. It takes time and a lot of effort to know someone well enough to fall for them. People often confuse lust with love.
Very, from my experience a guy told me he does it because females like to hear it. And most times he said he even had sex with them, knowing sex was only what he wanted. My opinion complete dumb ass but guys do use it as running game I guess.