If a girl gives me email instead of her phone number, does that mean she has plans for you if she has a boyfriend already?

I mean, I wouldn’t stop her if she came onto me. And we do flirt in person. Does she think we would be flirting while texting each other too, and is trying to hide it from her boyfriend? I mean she did only mentioned him once in the entire 5 months we have known each other.
If a girl gives me email instead of her phone number, does that mean she has plans for you if she has a boyfriend already?
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