Is this interest or being friendly?

This girl wanted to exchange contact information with me. I gave her my number. After a guy came by said he was on instagram, etc. She said I'll follow you. He then said asked for her number. She said I don't like giving out my number, you have my instagram you can message me there etc. She even texted me the next day, like nice meeting you last night etc. Could that be interest? Like I was just having a friendly conversation with her while the other guy literally just saw her and asked for her number. I know it could be interest, but it could be friendly right? I was actually talking to her and being nice while the guy was just going after her and all etc. I had just met her though that night.

Is this interest or being friendly?
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