Afraid to admit im in love?

im a recent high school graduate. i have not been at my happiest lately, but i have never been the type of girl to dream of being in a relationship in order to to find happiness and fulfillment. however, i am the happiest ive been in a long time whenever i think of "him". i miss him through most of the day, even if i just spoke with him or just saw him. i get the butterflies whenever i think of his smile or his laugh. we can sit anywhere for hours and it feels like minutes. we laugh, we cry, we kiss and hug. needless to say, we're pretty friggin cute lol. the reason i ask "am i in love?" is because i've thought i've felt love before on 2 separate occasions. the relationships were short and fast. one ended badly and was not love, now that i look back on it, but i was sure it was then. the other time was long-distance, but we would talk forever about everything and always had so much fun together, but ended up just being really good friends. both times i was dumped and didnt really see it coming... so im just afraid that this time ill start to think im in love, just to let myself down in the end. how do i know he feels the same way?