Is it okay to ignore my coworker?

So me and my coworkers are in a group chat together, he asked if anyone knew what time he would be going in.
I sent a pic and said hope this helps.
He later messages me and ask me if I was in because he wanted me to take his order.
I wasn’t so I couldn’t.
He later messages me later at night around the end of my shift saying “hey how are you”
I ignored it because, I’m not sure how to feel. Im almost certain it’s not work related but I don't know.
Why do you think he did this and could it be him trying to talk to me like as a friend or as more?
Is it okay to ignore my coworker?
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