<human>: Hello internet, my question is above (I should've wrote "I like this guy..."), the full story behind this question is below:

so I have been having feelings for this guy for the past two months but I have never acted upon it because he has been giving me mixed messages. Like he'll sometimes tease me and do pranks on me when we're alone by ourselves. But then whenever his friend is around, he'll talk to his friend and kinda ignore me 70% of the time.
However, I did something really mean to him: I recently asked him to be in my group for a group project and he said yes, but then I had to ditch him. I found him another group but I thought he would hate me, but he reacted the opposite. He was naturally pissed at first when I told him that I had to ditch him but then after a few hours he fb messaged me and I was apologising to him and he said he was joking about being pissed at me. And now we're back to our normal conversations. So I think this means he does kind of like me? But I feel like he shouldn't be cos I certainly wouldn't if I was him (unless I like the person).
So now I have decided to take charge of my life and I want to start to know him even better. We don't know each other very well since we don't see each other often. 
My only way of contacting him is through fb messaging so I was thinking of talking to him more through fb. But I'm worried that he'll find me annoying if I talk to him all the time? How much should I talk to him? Once every three days? I am thinking of talking about music, food, hobbies with him so I can know him more before I commit to chase him. What do you all think? Anything will be appreciated!
I hope to get his number (or hopefully he'll sense that I like him and ask for my number) after messaging for a bit.

Could you distill the essence of the text into 1-3 sentences?
<bot>: I like this guy who seem to like me back. But I don't know him well so I am trying to get to know him more through messaging but I don't want to annoy him by messaging him too much.