Help, I've made a stupid mistake and now I'm regretting it?

So last summer I moved into a new school. And I have just about an ordinary relationship with everyone in cl whether they are boys or girls. Not to brag, but I am pretty smart in cl and somehow everyone see me as diligent. So a lot of them actually likes to text me to ask school ignments and so I grew closer to many of them. This one boy, lets say his name is Noel, is getting really close to me. But at that time he has a crush on another girl and besides I have no feelings for him. So he talks to me a lot about her and he always asked me to help him to get closer to his crush. And so we talked a lot, and then he starts to act weird and giving me attention and all. Sometimes in cl, he held my hand, he became interested in my love life, he likes to rest his head on my shoulder, etc. And so I know he likes me, and not for long he actually admitted his feeling.My clmates and some teachers actually noticed that we are getting really close. It was so embarring and when they caught us when being affectionate they will make these annoying "aww" sound and the whole class will start looking at us. It was so annoying cause I would rather lay low. Actually I wasn't bothered with the affection sometimes I actually enjoyed it. But at that time, I don't have any feelings for him and I considered him as my brother. Then he asked me to be his gf, but I think it was too fast and I want to take things slow. I think he understands and I heard that he would asked again in a few month. As time passes by, I think he's getting too comfortable around me and started to be annoying and started to insult me. I know his insults are jokes but most of it are really offensive and has really crossed the line. And so, at one time, when I couldn't take it anymore, I didn't reply his texts. He knew I was mad at him and he sends me all these apology texts but I didn't replied. At that time it was actually at christmas break. And so after he break, when we met at school, it gets really awkward. Thus there's this huge space between us that keeps on growing. At some times, he would ask me questions but not like important ones, e.g when a test is being distributed he would ask me what's my score. And I think he still likes me because his friends at one point would joke around about us and I can see that he gets really nervous. And lately I can't stop thinking about him and I kept on regretting for being mad at him. I mean it was a joke after all and he did say sorry. But I want to show him that there's a line in making jokes especially offensive ones, I was a little angry but not that angry though. I just wanted to give him a wake up call. HELP ME! what should I do? should I back out and let it go? or should I try to win him back? PS I don't want to tell any of my friends because I don't want the story to spread. and also, sorry for the long story :)