Girls, how often do you do this?

I suspect that my girlfriend is catfishing me to see if I am cheating. For those of you who don't know what this is, it's when you make a fake social media account in order to talk to someone. Anyway, new Snapchat account with no score randomly messaged me. Almost immediately asked me to send nudes. Then when I said I wasn't a cheater, offered to send me nudes for nothing. Sent me a snap and I didn't open it, went off on the girl and then blocked her. My question is how often do girls do this to test their man's loyalty. Is it a common thing or am I seeing things that aren't there? All opinions are helpful. Thank you ahead of time.
Girls, how often do you do this?
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