This French (?) movie is probably from the 80s / early 90s. A beautiful dark haired young woman seduces an older man, who initially can’t understand what she finds in him. Later on it is revealed that she is out for revenge because the man caused an accident in which her boyfriend was killed and fled the scene (or something like that). Maybe he was drunk. In any case the man had something to do with her boyfriend’s death.
I think she mentions that she has a “Greek foot” when she is in the bathtub.

I remember a flashback of somebody racing through a tunnel on a motorcycle, possibly several flashbacks, leading up to the revelation that the boyfriend was killed in that tunnel.