What do he means by this?

I found out a guy I liked is married to someone else. He sent me a photo of him wearing a black tie with a white tuxedo. He said you should see things in black and white. What could he mean by this? He said that he’s not leaving his wife. I asked could we be friends but he said that I should see things in black and white.

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It’s the black and white part I’m not understanding
What do he means by this?
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