He is attracted to a woman who is engaged to someone else

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Check below answers in case you are looking for other related questions:
Is it permissible to correspond with one’s fiancée via e-mail?
Is it permissible for her to wear a little makeup when a suitor comes to see her?

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Related Answers:
He loves a girl but his family refuses her because of her father’s bad reputation
Is what he did to find out about his fiancée correct?
His father chose a wife for him who he does not want
Is it permissible to correspond with one’s fiancée via e-mail?
Is it permissible for her to wear a little makeup when a suitor comes to see her?

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