My Coworker gave me her number without me asking, what does that mean?

I work with this lady at my job., She’s real sweat, smart, and caring…, We always talk to one another about things such as food, travel, movies, family, and etc, but we never talk about relationships…One day she asked me “ would u like to exchange numbers” I said “ Of course”.. We exchanged numbers, but I feel like she doesn’t like me in a romance or looking for a boyfriend type of way.. So what can it be?

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It’s this female coworker at my job I’ve been knowing for a while now. A few months ago she gave me her phone number and I exchanged mines. We text casually outside of work. She called me the other day and we was on the phone for like 25 minutes, it was a casual conversation. Nothing special, like how’s your weekend, what u eat, how was your workout in the gym, and etc. She’s also a single parent. I dont if she like me or just being friendly., I’m kinda shy with low self esteem
My Coworker gave me her number without me asking, what does that mean?
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