Guy said he missed me after meeting me once

I am currently in a LDR (not officially but for context). We met for the first time a few weeks ago and have been texting everyday since then. We called the other day and he told me that he missed me and I had a “bad” reaction (I didn’t say anything). I am interested in him but it just threw me off guard because I had only met him once. I really like him and I am excited for the next time I see him but I wouldn’t say I miss him. Now I just feel really bad for not saying anything but I’m not sure what I could’ve said. We haven’t talked about it since then but now I’m just concerned that it may affect what we have going on.

Has anyone else been in this position before?