What does it mean when a woman texts you constantly back throughout the day but doesn't text me back when she's with her boyfriend?

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I don’t know what you want from this woman, but if it’s romance, then you’ll need to put it on hold until after she breaks up with him.

Texting is time and attention consuming. When I spend time with my lady friend, I don’t text anyone else. My full attention is on her.

You’re her friend. Friends don’t place expectations on each other normally reserved for lovers. If your guy friend doesn’t text you back when he’s with his girlfriend, would you wonder why?