My boyfriend wont text me back?

i sent my boyfriend 4 texts and he still hasnt responded. its been a few days. and im getting kinda worried. i no he wuld never do something bad to me. and i no he loves me. im not trying to sound all girlie and all (trust me, im not) but hes my world. and its summer and im scared that wen we go back to school that he wont have interest in me anymore. what do you think and what should i do?????? HELP!!!!!