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We fought about her before because he said things that made him sound like he's single.

Or

We fought about her before because he said things that made him sound like he was single.

Are both correct? Whats the difference.
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The 2nd is standard regression with reported speech, that is all. I think you mean 'fought over her'.
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Mister MicawberThe 2nd is standard regression with reported speech, that is all. I think you mean 'fought over her'.
Thank you for always coming through w/ your expertise Mister Micawber. I know I can always count on you.

What is standard regression with reported speech tho?
Start by reading about [url=http://learnenglish.britishcouncil.org/en/grammar-reference/reported-speech-1 ]REPORTED or INDIRECT SPEECH[/url].