[logicallee]

You are suggesting she exfiltrate my phone number by memorizing it? I don't think that's allowed. I wouldn't do that if it were considered a data leak.

Can you suggest any other approaches that do not involve exfiltrating data from a secure site?

[linkpuff]

Yes, I am suggesting that. Unless you believe that one can't think about work duties while cooking dinner. Otherwise she would forget entirely about your person at home. But I want to tackle this from a more serious angle, have you researched common signals of romance scams? The black site excuse to not use a phone is very suitable for a guy pretending to be a woman so he doesn't need to get a phone number and a voice modifier (a poor job at either would lead to destroying the scam)

Plus... wouldn't a black site also not have mail?