I did not meet a friend from college, now I feel horrible

A friend from my college had told me he will be coming to my neighbourhood and he will call me and meet. I told him we will meet for sure. He came and called me, I did not pick up any of his calls. Then I messaged him that I am not at home. I don't know why I did not meet him. I think this is social anxiety, I cannot figure out what it is. I have a habit of constantly isolating myself maybe this is that.

One thing I am sure of is that this will now affect my friendship with him. Where I am from, people have huge egos, especially over things like this.