Was he nervous or is there something weird?

I have very limited experience in dating. My friend suggested me to get to know one of her boyfriend's friends as she thinks that he might be perfect for me. I decided to go for it.

He added me and we started chatting. He seems nice. We decided to meet face to face. I informed my friend about this meetup. When he saw me, he had this prolonged eyebrow raise (both eyebrows). I dont know what this was supposed to mean but I smiled (even though confused) and said hi.

We went for a drink and as soon as we sat down, his phone rang and said he needed to take this call. As soon as he took the call, he looked at me, smiled, and in a low voice he said 'we literally have just met' and then, looked at me again, his face flushed, smiled, and said 'yes... a lot' and then hung up.

During his call, I started thinking again about his expression when we met and also about the call... it felt weird. I was thinking of actually asking him about it, but it felt awkward so, I continued wandering while looking at tv nearby.

We talked for a bit about ourselves (sometimes with awkward silences) and he mentioned his friend (my friend's boyfriend) stating that he was his best friend. Throughout the date he asked me more than once if I knew his best friend (I don't) to which he was surprised to my response. Then, we went for a small walk. I noticed that he clenched his hands in his pockets while walking and talking (sometimes he started walking very fast but then like slow down).

Anyway, apart from these things I mentioned, it went ok. Overall he seems like a nice but shy guy. He asked me out for a second date and I don't know what to say. Do you think he was just nervous or is there something weird?
Was he nervous or is there something weird?
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