Bruh!!!!
Get a TracFone, you can get it at BestBuy, a gas station or grocery store; no id needed. Buy airtime then activate it over the phone or online.
Or just download an app to your phone for a second #, TextNow works ok.
TBH you already gave her all your personal info so giving her your # shouldn't really be an issue for you.
Fooook!!!
Fyi be sure to submit reports about your experiences here:
https://eccie.net/forumdisplay.php?f=1817