what do it means when you keep saying some ones name?

No, it is not because it happens they talk about you. But, it is the product from your inner mind, subconscious mind . You are not thinking of that person, but in you mind, you are and you are not aware of it. That is why, when presently you are in confusion, that person names to come out first in your mouth without even knowing that you almost said his name.

Maybe you are thinking about this person in your subconscious mind or something like that. Then again, maybe you have stronger feelings for this guy than you think you do, and maybe you keep saying his name because your mind is starting to realize this...

I think that you are probably supressing feelings (positive or negative) about this person. Your concious attempt to remain unconcerned is counterproductive to your true urge to express the way you truly feel. So your subconcious is causing you to mention this person without your being aware of it in order to alleviate the pressure and tension caused by burying your feelings. The best thing to do is sit down somewhere quiet where you won't be bothered and really think about this person while you honestly note how you feel. Figure out if this person is filling a need or draining you; acknowledge and accept your emotions about this person and the surrounding circumstances. Some times just paying attention to what you really feel can alleviate things like freudian slips and actions motivated by the subconcious. I think this is probably more logical than making superstitious assumtions, although it is possible that the two of you may share a telepathic link. The two of you would have to test the connections through a series of specific tests to determine either of your abilities to transmit and or recieve exta sensory information.