What do I do?

So i am currently dating someone and he’s good at football and our football team this year was not good and last year we had about 4 good kids leave our school to go to another school because their team was better and this year after the football season he said he was gonna transfer to the same school the four kids went to last year and he is switching at Christmas break which is coming up because its November and i feel like he is going to find some one better than me at this new school and also i am so used to seeing him at school that when he is sick or gone from school it just feels weird with out him there and his best friend does not want him to leave either, and we are coming up on a year together and i am just scared of what is going to happen, and i do not know how to deal with it. Please help!