i cant let him go? please help?

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im 15 hes 18,please do not judge me, i judge myself everyday, i lost my virginity to him about a month ago, weve been talking for about a year now. we've had sex like 6 times, i thought i was pregnant but luckily im not. im so thankful for god helping me with that, i prayed everynight he would forgive my sins. the worst part is.. i feel so different ive become distnce with my friends and my hormones are acting crazzy, im so attached to him. i cant get enough and the sad part is.. he doesnt care. usually i sneak him through my window and we do it, but if we dont hes fine withit, but idk so im on my period and i told him to come over but he said hes too tired. but he said hed come over thurs, when im off my period.
hes so hot i dont see why he would want to use or take advantage of me? when he could just go get someone his age and someone better? he has plenty of other girls, i have sen his instagram.. theyre always commenting and liking his photos.
why am i so attahced? im always texting him first how do i stop? but when i dont text him i feel like he'll forget about me and never text me but when i do , he always replys with a "hey(:", could he not be using me? or is he? what do i do? i just cant let go, when im with other guys i think about him, and what he would say and what he does, whats wrong with me? if he wanted to talk to me or really be with me he would, right? he wouldnt have sexx with me if he did like me right?
he told me he likes me we just cant be together.
i just need straight up advice, i want the honest to go truth
btws , hes not a jerk to me, sometimes he can be though