Both are correct, depending on the tense you wish to reflect . . .
Became: we call the simple past. Sometime in the past without any specific time conditions built into it, ...
"Between you and me" is correct.
I think the confusion here comes from a legacy of overcorrection. Many of us were scolded as kids for saying things like "me and my friends ...
The short answer: it is wrong but could possibly be okay.
The long answer - it is functionally wrong because of the functions of present simple grammar and the functional us...
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