I'm unsure and confused about him?

I kinda think he's using me now. i met this boy and he's was amazing and we hit it off, our first conversation lasted 12 hours, anyways he's always like hey beautiful and very into me, and lately it feels as he's starting to lose interest, and vibes have changed, hey princess/ baby went to hey, and what he normally would respond to went to K, like just 2 days ago, we could talk and laugh and i would feel just great after talking to him, now it feels like he's been losing some interest, maybe cause of the distance, idk. but while still in the GREAT AMAZING stage, things started to get ual(we are both still currently virgins) anyways, just like the past few days he's like the way he used to be, when we talk ual and do stuff, but when i try to have a regular convo, it's different. and idk, it just feels like more and more he just wants me for pleasure and could care less about convo' last time when this was kinda starting i brought it up and it made him feel like crap and i adore him and don't want to make him feel bad, but maybe something happened in the past few days i don't know about. but still. do you think he is? his I love you's(i just think he's infatuated, but im still so into him) have gone from when i say i love you he used to be like I LOVE YOU MORE!!!!!!!!!! to love u 2. I think i'm over thinking and over reacting, but i just have this yucky feeling about it. just the vibes. any advice? I don't want to get too attached to him, but i did, and I really don't want to lose him. never liked someone so much, maybe it's just a bump and things will go back to normal where we would talk for hours. for example ims went to: I ******* missed you! so much! to hi! and he would usually be the one to talk first, but not now, unless he's horny. but it did just happen the past few days.