How to know if a girl is a drifter?

Felix012
By drifter I mean a girl who finds another guy if the guy she's currently dating no longer serve her purposes. I'm now dating who I suspect as a "drifter", because I was that other guy. She used to date this guy but she was flirting with me, then she just ditch that guy and now is currently dating with me. She also had one previous date, which was a failure in the end.

What's unusual is that she still show signs that she likes me. She has low self-esteem issues. Plus she has depression because of a chronic disease.

Regardless, What are other signs that a girl is a drifter? Is she even a "drifter"? Should I escape from this girl now?

How to know if a girl is a drifter?
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