Why would/did she give me her number if she has a boyfriend?

Anonymous
Okay this is sort of a 2 part question. I've been liking this girl who I'm acquaintances with for a while now. Today I asked her if she'd like to go out sometime and she said yes. So she gave me her number and I added it into my phone. Then I saw her profile picture on whatsapp and it's a picture of her kissing a guy who I can only assume is her boyfriend. My question is:

1. If I asked you girls "would you like to go out sometime?" what would you think that implied? Was I not clear enough that I wanted to take her out on a date?

2. If she has a boyfriend why did she give me her number? Did she not understand what I meant when I asked if she'd like to go out sometime?
Updates
+1 y
I would also like to add, me being the observant self I've noticed something about her. Half the time I see her she has a ring on her wedding finger, and half the time she doesn't. But I don't think it's an actual engagement or wedding ring. Just looks like a normal trendy ring.
Why would/did she give me her number if she has a boyfriend?
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