I have a crush on my colleague but we have never flirted, she's been giving me mixed signals and I'm not sure should I make a move?

I'm attracted to this girl at work. We tease each other from time to time and she keeps telling me about her past relationships and what she doesn't like about her exsand men in general even without me asking. Recently she told me that one guy invited her for a date but she complains to me about how bad he plans the date etc. and she doesn't tell such things to anyone else at work except me. at this point I thought I'm already friend zoned so I erased the thought of making a move from my head I didn't make a move until now because I don't want stress at work if things don't go well. Can you please help me understand her behavior?

I have a crush on my colleague but we have never flirted, she's been giving me mixed signals and I'm not sure should I make a move?
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