Quote help?

Sounds like something someone made up on the spot.

I googled it, which I often do for quotes I half remember. No hits on this one, so my guess is that you are the only one that knows about it.

It’s not a very elegant, clear or well-written statement. Perhaps you are paraphrasing?

It seems like it might be a paraphrase of “A man is the sum of his actions, of what he has done, of what he can do, Nothing else.” (generally attributed to John Galsworthy).

The sentence you give sounds like it might have come from a Dear Abby column. I’m not being facetious, that’s actually what it sounds like to me.

Possibly this is what you are referring to:

“A person isn’t who they are during the last conversation you had with them – they’re who they’ve been throughout your whole relationship.”
Rainer Maria Rilke

It also reminds me a bit of a favorite Maya Angelou quote:
When someone shows you who they are, believe them the first time