Why do I do these things?

I have no desire to date the gentleman who just asked for my phone number. He's older than me by a lot and I'm not attracted to him. Then why did I give him my number? Why not? I don't have many friends. It's not like he proposed marriage... If he calls, we'll hangout. I'll let him take me out for a milkshake or ice cream. It's no big deal. I've got to start making friends somehow, right?