Why are girls so confusing?

So me in this girl where texting and things started out slow but the more we talked the more we began to enjoy the conversation at least so i thought a couple times while chatting the girl would just stop replying out of nowhere and then would reply like 40min later so the texting resumed and i asked for her number this all happened on ig i should mention yea but she said no to giving me her number but she gave me her Snapchat instead we talked on snap sent a couple snaps back and forth and then she just stopped i know she's was on her phone she opened the snaps i sent and posted on her story like 20 min ago so why did she just stop replying to me out of nowhere?
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