Would a girl pull away from having conversations if she secretly had someone else?

I've been talking to this girl. Sometimes we have our deep moments, sometimes we're more casual , but she seems interested in me. We talked about her past relationship with another guy and how we both have trust issues entering our next relationship..

We're still at a friendly stage but I've been starting to open up more and more in deeper ways and her responses are very short but still engaged to a degree. Sometimes she takes time to get away from her phone to do other things. I have a fear she might be with someone else and she just to be friends. She seemed to have liked me and showed signs by wanting to get to know me. Would she have friended me if she had someone already and have still asked me questions about what I like and my relationship with my ex? Would girls do that

Would a girl pull away from having conversations if she secretly had someone else?
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