Guys can you please help me?

Okay. So i texted this guy(that i like and he knows i like him) and he told my friend he thought it was really annoying even thought he texted back like 15 times after i did. Anyways, it's so weird between us now and I have to see him like everyday at school. I feel so bad for what happened. If i knew it was annoying him i definately would have stopped. I want things to be okay between us but i'm not sure how? Also, how long do you think it will take for him to forgive and forget??? And we'll be graduating this year and stuff so I want things to be good before summmer preferably.Since next year will be even worse since he'll be in my homeroom and probably have more cles together. Thanks for your help!