Confused and disappointed

I'm not sure if this is the right thread for it, but I'd like to share something that I'm otherwise frankly to be too ashamed of to say.

So I never had any relationship and only once someone was interested in me. I was bullied for a long time during my school time and my self-esteem and all is quite low.

I met this guy the other day at a concert. I didn't know him at all but I liked the way he talked and his smile. So I gathered all my courage and went up to him and said that I thought he was nice and if I could give him my number. He said yes, smiled at me, talked some more and hugged me goodbye. I was so happy. For once I felt like.... Seen. We texted a few days later just back and forth. Then yesterday I asked him whether he wanted to grab a cup of coffee sometime.

He said he's sick and busy right now, and also that he doesn't see a romantic relationship or a closer friendship for us two. I was a little bummed but like... Hey, I hardly know him anyway, it's not that I expected/wanted a romantic relationship really. So I said, no worries, I prefer him being direkt and that I'm not l sad. I'm just interested in music and would like to chat with him cause I still think he's nice.

He just replied that I then also could just ask him via text.

I'm confused and hurt. And knowing that this is a minor thing makes it worse... I wasn't expecting anything. And I know I shouldn't ask him basically to justify why he took my number in the first place. I'm just lost and ashamed.