Train Scene 1: In the beginning of the movie, Brandon (Michael Fassbender) is in a subway and while travelling he keeps looking at a very attractive woman and the woman also responds to him with smile and all of a sudden her smile turns into a serious expression and tries to leave the train and Brandon follows her to catch her but she disappears in the crowd.
My analysis: In the train, The attractive lady is also into Brandon but suddenly she realizes that she's married, (I assumed it, since she's wearing two rings.) so she feels guilty for responding to a random person and leaves the train to escape from Brandon.
Train Scene 2: In the ending of the movie, again Brandon and the attractive lady starts looking at each other. This time, the woman holds on to a pole and she wears only one ring.
My analysis: As she's wearing one ring this time, my brain told me that she's not married any more and not guilty to get close to Brandon.
My question is, whether my analysis is correct or not? If it's correct, Why the director made the scene so complex to understand by making the lady character to wear two rings in the beginning and one ring later? Why can't simply make the woman to wear one ring in the beginning and no ring later so that audience can understand that the lady is neither married nor guilty to get close to Brandon since both are into each other.