It exists and the Jedi masters confirm that such bonds exist between masters and apprentices.
They also state that given your character's history with the force, that such a strong connection in so little time is quite possible.
Also, I don't recall Kreia ever saying that the connection would be lethal. Your character speculates that the death of one of you would be the death of another. Kreia, like the other masters, is surprised at how strong the bond actually is. No one really knows what would happen.
I believe her response is "Perhaps" and then you both decide not to test it.
(I particularly like the line that goes something like "given your age, you could die at any moment!" )
So apparently your bond with her is unknown territory. And given everything else you learn about your past, anything goes with the Force.