Not necessarily
Usually means they are interested in you
it means that they may be into you.
It means he likes you at least. =]
Well it most likely meens that he likes you but is trying to see if you are even intrested at all in this guy to see if he has competition.
It means the guy's friend has a thing for you, he likes you but knows he can't have you, so he teases his friend about you.
If a guy teases you it's because he is the spawn of the devil and wants to be mean to you. You will then probably think he likes you so he will have sex with you and then crap on your chest after wards and leave you
if you like the guy, lead him on and hopefully he will like you.
They say if he teases you.
He is jealous.
If someone teases you it may mean that he fancies you. If a guy teases you it usually means he wants to get your attention or see how you react. When he teases you, just smile at him. However, it doesn't always mean he likes you. It may be the opposite. I suppose it depends on whether the teasing is mean or not...
It means that the guy has a weird way of flirting. That, or he is just a total jerk.