Why do guys leave girls on delivered for a long time then watch your story then reply? + Why do they flirt with you when they are talking to someone?

I was talking to this one guy, and we had a great connection instantly; we clicked. He asked for my Instagram, so I gave it to him because I was interested. He was constantly flirting with me in person, smiling around me, and wanted to call me a lot. We texted for a long time, but I feel like our conversations got drier each day. He also said he liked another woman while flirting with me? I don't understand. He once said he, if I could call him, and that lasted for an hour or so; it was pretty late. I've been on delivered for a week, and I posted a story, then he replied, which I find weird. So, why do guys do that?

Why do guys leave girls on delivered for a long time then watch your story then reply? + Why do they flirt with you when they are talking to someone?
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