Hello c.cohen12 & hello Silverdragon ~ welcome to you both.
I think that Silverdragon's responses sounded very helpful, but it seems that you have already done what was suggested, C.cohen, so this is difficult
Yes, I think that maybe you could have broken his heart and possibly even dented his ego.
If you are in high school, then I presume that you are both teenagers ~ and the teenage years can be very emotional ones.
He may feel sad that he wasn't what you wanted, and feels that he cannot change.
He may feel angry that you behaved as you did.
He may feel guilty that he didn't pay you attention.
He may feel confused about how he feels now and what he wants.
He may feel betrayed or distraught or any other negative emotion.
It seems that you both care a lot about each other, but still managed to upset each other.
Maybe, if you really have got something special, time will heal the rift and you will be able to sort things out.
I hope so. Good luck!
