Why give me your phone number if you weren’t going to respond?

I am 23 year old guy, who has never really had friends and has never been a romantic or sexual relationship. So I know my social skills are poor. But I just don’t understand why you would give me your number and not respond when I text you.

Please allow me to set the scene.

I have a neighbor (25m) who is pretty cool and have a lot of similar interests , he seems social enough, always talks to everybody and waves, so I figured i would ask if he would want to hang out some time. (My intentions are purely platonic, I just want a friend. ) He said sure, gave me his number and we went about our nights. It took a lot for me to ask so I know I looked and sounded nervous. I gave it a few days before I texted him because I knew he said would be busy. My text just said “Hey, this is \*blank\* right?” he said “yes, who is this?” I responded “sorry I was just making sure I had the right number. This is OP from next door”. he never responded back. I though my text might not have gone through so I sent another text that said “hey, this Op from next door. I was just wondering if my last text went through?” again, no response. I ran into him again a month later and I’m pretty sure he forgot my name. Kept saying “hey buddy. Hows it going buddy. Have a good one buddy”.

Please don’t make fun of me, I’m just trying to understand what I did wrong. I’m tired of just being a background character and want to have at least one friend.