Understanding women

Just back from seeing one of my fav films. A small arts cinema nearby was showing Talk to Her tonight only. Saw it years back when it first came out, and since bought it, so was really excited to see it on the big screeen again. There is a scene in it that I find interesting (well, the entire thing is thought provoking, but this one could generate some good discussion I think). A woman and her partner and out listening to live music. She is sitting and he is standing. The music brings tears to his ears and he walks off to be by himself. She shortly follows after, reaches around to hug him from behind, and the convo goes something like this:

Lydia: "Marco, I've always wanted to ask you, why did you cry the first night we met, after you killed the snake in my house?"
Marco: "It reminded me of another time I had to kill a snake. We were in Africa. She had the same phobia as you. She was terrified, and completely naked."
Lydia: "Is she the one for whom you slept on the couch?"
Marco: "Yes."
Lydia: "I hate that woman." (Kisses Marco) "What can I do to make you forget her?"
Marco: "Exactly what you are doing."

Hopefully that'll wet your appetite to rent the movie;) More background info re: the above:

Lydia ran out of her house screaming the first night she met Marco. He gave her a lift home. He went in to kill the snake, but she refused to enter the house again and went to a hotel. Part of the reason she didn't want to return to the house was that she just ended a relationship with someone she lived with there, it is assumed. He cried after killing the snake. He later told her he could no longer sleep in his bed after ending a previous relationship and slept on the couch for a week before deciding to buy a new bed.

When I was in high school, my bf at the time pointed out a former girlfriend to me who had hurt him. I can't really remember the circumstances, but i strongly disliked her thereafter. I disliked her even after he and I had split. I find it interesting that Lydia 'hates this woman'. He was hurt by her, but he ends up attending her wedding towards the end of the movie, and is finally over her, 10 years later. Anyway, any opinions on why Lydia feels this way...and what that says about the nature of women?