How to know if i actually like someone?

A while ago I found out from a friend that another of our friends told her he liked me. She thought it was okay to tell me since that was last year. I never looked at him romantically or anything but he's a good friend and I like that I could be myself around him no judgement.

But now that she told me that I can't help thinking about him sometimes and idk if im being delusional but looking back at some of our interactions recently I feel like he may still like me.

Never been in a relationship or dated before and I dont think im ready to, cause im always busy. But I also would like to...but idk. Its been about 4 weeks now since I found out. So whats the time period to know if you actually like that person? Or what can I do to know?