I don't know if he likes me

Hi everybody, I recently posted about a guy I have feelings for, but more has happened, and it just makes me more confused. So just looking a little help.

As a refresher, I work with this guy who I was immediately attracted to. I'm not positive of his sexuality, but he has been with girls before. He hasn't been in a relationship for over a year because he says he was never "ready", but said he's ready now. Normally, if I ever have doubt with a guy's sexuality, I'm never forward, and I just observe. So after speaking with him a couple times, I couldn't help but wonder if he likes me. He seems so flirtatious with me. He gives me a hard time about everything! He is not like this with anyone else. It's always jokingly, but when I pretend to be mad, he really enjoys it. Also, he really seems to like when I work with him. He seems happy when I get there, and sad when I leave. He even told me he was disappointed that I had to go one day.
Then recently, he came up to me and said "If you ever need your shift covered or anything" and gave a me a piece of paper with his number. I didn't think much about it at the time, but then, I went out drinking with some friends, and got brave enough to text him. Other than me being a little flirty, the conversation wasn't too bad. It was fairly short though, cause I got distracted. He seemed very cool about everything I said.
Then the next day, he out of the blue texts me about a joke he made a week ago.
He never had my number before, but since I texted him, he had it. So I don't know if that means anything or not. We have never spoken before outside of work. Lastly, yesterday, we worked together, and he called himself a workaholic jokingly. I said "I have a few adjectives for you, but a workaholic isn't one of them" and he was very curious about what my 'adjectives" for him were and brought it up more than once.
So I don't know, he confuses me a lot. What do you think? Is he just a typical guy? or do I have reason to believe?