Is my sister's argument with her boyfriend none of my business?

Anonymous
A couple hours ago I overheard her arguing on the phone with her boyfriend. It sounded like a yelling match. Then suddenly it got solved quickly and they both apologized to each other.

I got curious and I asked her what was that all about. She replied with an ''It's nothing and I really don't think that's any of your business''. Really? Them arguing is none of my business? I'm still her older brother (she's only 21) and want her to be happy. She said she already is.
Is my sister's argument with her boyfriend none of my business?
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