Just to add a bit more into what Erydian said. Jaheira's romance is quite buggy. Installing ToB should fix this, but if you don't have it you may need to do some debugging. The command:
CLUAConsole:GetGlobal("JaheiraRomanceActive","GLOBAL")
It should have a 1 or 2, which means that the romance has commenced and you are "dating". A 0 would mean that you haven't started, 2 would mean that you were an item, and a 3 would mean that you must've done a BAD THING and she's dumped you.
If the number is 3 for any reason, then type in the following:
CLUAConsole:SetGlobal("JaheiraRomanceActive","GLOBAL",1)
This will reset the romance back to "dating" stage and we can manually set it to where it should be.
Then type in the following:
CLUAConsole:GetGlobal("LoveTalk","LOCALS")
while the cursor is on Jaheira.
This will let you know where the romance is up to, or if it has been halted by a bug.
Let me know what the number is and I'll be able to help you further.