Is he into me and is he flirting with me?

One of my coworkers at work we've been talking a lot and he's been one of my closest friends since he's known that I'm leaving the company.

The other two day he bought me coffee and bubble tea which was so nice of him.

He always wants to sit next to me and have banter and annoy me a lot, and we always leave together at the same time. There was one then where we just had a break and went on an hour walk and just chatted for a bit. Not sure if he likes me or not.

Is he into me and is he flirting with me?
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