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this thread, which discusses Aredhel at some length.
I was initially skeptical of the viewpoint that Eol only married Aredhel primarily because of his lust. However, after further review, I've changed my mind. The way that he tried to control her indicates that to some extent he viewed her, and Maeglin as well, as possessions rather than as people. I think that if Eol had been more concerned about her as a person he would have discussed with her rather than decreed to her.
However, this type of thing is no uncommon problem between people.