What does "need space" mean?

When someone tells you they need some space, it does not mean they don't want to talk to you anymore. That person just wants you to call them a little less,don't come to their house as much; if you get what I am saying. Sometimes a person may feel like you are taking up to much of there time, or you are expecting to much from them. So, they would like for you to give them some space. When a person tells me that, sometimes I go awhile before I call them, or go to their house. So, they can get a lot of space from me.

Your overcrowding whoever said that and she/he doesn't want anything to do with you.

no not most of the time
but it could mean that she's not thinking about you in that way anymore
but she doesn't want to mean about it so that's the line
she uses

Needing space means breaking up. It's a lame excuse and falls right in there with "it's not you, it's me".

OR, she could be planning on becoming an astronaut :)

OR, it could mean that she wants to watch Star Trek :)

OR, she may be referring to getting an apartment :)

Dude you need to bounce out of that situation, not now; but RIGHT NOW!

The best advice I have ever received was from a hood rat, " shit; your a man , you don't chase them, you replace them!.

It means you have been re-released in to the wild. Time to go be a savage, put as many chick between you and her as possible.

Usually it means she wants to see other people. On rare occasions it means just what she said and she wants some space, where you're not spending all your free time around one another. But usually it means she's interested in seeing other people, or is a precursor to it.