Look girl, i understand that youre probably forced into private school by your parents or you heard gossip about yourself or you were bullied or you feel bad about not telling anyone about the transfer or something elese or even a combination of all these and thats why you put distance between yourself and your own friends and didnt talk to them.
BUT if you care about this guy (and clearly you do) then you gotta nurture that connection. Not just wait for him to talk to the girl that distanced herself, not just wait for a moment like this chapter to magically present itself to you, you gotta do the smalltalk.
And i dont mean you have to sit down next to him and chat about your hobbies or anything, you just have to do simple stuff. Greet him when he comes on the bus, say goodbye when you/he leaves. (Waving is also a good first step but evidentally he figured that out before you). Maybe make a remark about something happening once every while (the weather, the changing season, etc). Simple gestures like that can build up rapport and eventually, when you feel comfrtable enough to actually talk with each other again, it wont be as awkward. Show hom through your words and actions that youre interested in maintaining that connection and he will most likely answer in kind.
And i know shes just a kid and its rich coming from me, who is more than twice her age, but cmon, its really not that complicated.
Thanks for the chapter.