Why would a guy act interested in a girl and never make official plans for a date?

musicloverr8
Recently I matched with a guy on a dating app, a guy I knew already previously in real life. He took a day or two to respond to my messages but acted enthusiastic when he suggested meeting up with me the following week for coffee, a drink, or food. I gave him my number to text me but he never did, this was a week ago now.
Why would a guy act interested, ask me out, and then never make plans?
Why would a guy act interested in a girl and never make official plans for a date?
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