I will attempt to explain the relationship between Ilsa and Rick and the relationship between Ilsa and her husband Lazlo.
She says that she cannot leave him again.
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Even though Rick shows emotion, it is regarded by all that he is a masculine character as is Laszlo.
She confesses that she still loves him and wants to be with him.
This is why I feel that in a way Rick is a slave to Ilsa because of his love for her that causes him to go these extremes.
The main focus is on a cabaret owner named Rick, who is torn between love and virtue.
I think she left him at the train station only because it was what was expected of her as a good woman and wife to Laszlo.