<human>: This is an update to this post:  where I talk about whether or not I should give my number to a guy who went on a couple dates with my close friend's sister.

I ended up deciding to give him my number, but since I'm shy I didn't directly hand it to him, I slipped it in a side pocket of his backpack. This was mistake number one. I spent two days making awkward eye contact with him, unsure of whether he saw it or not. (I know if someone did that to me I probably wouldn't notice it).
There were so many times I saw him through the day, but I was either busy or he was, so I couldn't get him alone to talk to him. This was stressing me out a bit too much for my own good, so I somewhat awkwardly told his friend what happened. He didn't really know what to tell me, but he said he'd try to drop some subtle hints that it was there. (Check your pockets dude).
It's been another day since that and still nothing, so at this point I've just come to accept that he saw it and he is so disinterested that he isn't even bothering to text me to say no. This is a bit of a blow because we genuinely seemed really flirty and I thought it was actually going somewhere. There's the slight possibility that he didn't see it and his friend didn't even tell him what happened, but I'm pretty pessimistic.

For the couple of days after I gave him my number it was after a major project so our class wasn't doing anything and we weren't sitting anywhere near eachother. But on Monday we're resuming class and we'll have to sit right next to eachother for 10 days and constantly interact and work together, and then after school lets out we'll still be in close proximity at some school events.

How do I act around him? Do I apologise? Do I ask him if he even saw the note, or is it too late for that? Do I ignore him as much as I can in that situation? Do I act like nothing happened?

Give me a shortened version of the text
<bot>: I gave a guy my number, unsure if he didn't see it or if he is really disinterested. Have to interact with him constantly for the next couple weeks, how do I act?