Is he not interested in me? Should I ignore him?

I moved into a new role a few months ago and met a guy from the team. We spoke on teams but didn’t actually meet in person til this week. He had been a little flirty. This week I met him and he said he was happy to meet me. Also during the day I caught him starring at me. He told me he was off to a concert after work. The next day I messaged him and asked how the concert was and he didn’t reply? He rarely doesn’t reply. Does it seem like he isn’t interested or maybe shy? Should I ignore him when I see him?

Is he not interested in me? Should I ignore him?
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