Should I text a female coworker that I like?

Based off of a previous question I asked, I have this co-worker, and she recently text me a video of me for when my job threw me a birthday party. So now I have her number. I don't know if she still has mine though. But to play my cards correctly and not go too fast, I still say hello to her face-to-face and she says hello back. But if I do have small talk with her, whether physically or through text messaging, what do I say? And how often should I text her or physically speak to her without her thinking that I'm obsessed with her? Please be nice.

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Should I text a female coworker that I like?
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