kare can also mean boyfriend.

kanojo can also mean girlfriend.

If you want to talk about the person with whom X is in a relationship, you can say X no kare/kanojo to mean X's boyfriend/girlfriend.

atashi can be used by males, but using it is akin to saying "I am homosexual!"

teme is the rudest form of "you." This can be translated as "you bastard" and is generally not to be used unless you're looking for a fight.