Yes, it's awful, but Hercule *did* fall in love...
A few people have written reviews expressing their revulsion with this modernization of this Christie classic. I agree, it is dreadful, however many have also expressed their consternation at Poirot having a relationship with a woman. While I do agree, that it is most doubtful that Poirot ever consummated his relationship, he did fall in love - in the canon - with a Russian jewel thief.
He met her in The Double Clue (Poirot's Early Cases) as the Countess Vera Rossakoff and in that tale he allowed her to escape justice. They meet two other times in the canon and in each Poirot expresses his affection for her, she is a nightclub owner (as in this movie) and he of course, an aging, famous detective.
"...nothing is left of me, each time I see her..." - Catullus