Usually it means he's flirting but it can also mean he likes you.
If a guy mocks u it is when they r making fun of u! they might like u!
He is jealous.
it means that they may be into you.
He likes 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
He wants you to tease him (if u r a girl)
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.
Not necessarily
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 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...
Mercutio teases Romeo about his love sickness regarding Rosaline in Shakespeare's play "Romeo and Juliet." Mercutio mocks Romeo's infatuation with Rosaline and portrays love in a cynical and humorous light.