What should i do... im scared this is gonna happen to me?

okk well im 14 years old and im ually active. i lost my virginity wen i was 13 to a guy tht i loved. and dont tell me tht im too young and i dont know what love is.. i know what i felt. but anyways im dating this guy hes 16 and i really like him and i think im gonna have with him.. im just scared tht hes using me just for and that hes gonna leave me after this.. wat should i do???