Was talking to sex about my girlfriend over texting. She said said I wish i could swallow your cum and then told her I'm starting to jack off.
I asked have you ever done that before? And she said "I have..." And then I sent a sad face and she said I meant I have been masturbating I never swallowed before.
Is she full of shit? If she lied about this God knows what else
You said you were masturbating and then asked her if she ever had.
It makes perfect sense that she's talking about masturbating.
But more importantly, why did you ask her a question you didn't want the answer to? If she's willing to sext you "I want to swallow your cum" you should assume she's experienced the sensation before.