just after I got off telos I tried to talk to Bao-dur on the ebon hawk and it wouldn't work so I chose him i my party on Nar Shadaar and he wouldn't follow me! But whenever i go to another place eg.the refugee sector the game will think that he's still with me. So I'll now have to start again because Bao is one of the characters that becomes a jedi

The same glitch occurs in KotOR. I think there is a fix somewhere, but I don't happen to know exactly how to fix it (I usually write these things down just in case, but the binder is in a box somewhere right now). Someone will help you, I'm sure.