What the heck is wrong with himm.....?

Okay I'm 16as well my boyfriend too I don't know what is wrong with my boyfriend we've been going out for like 18days and starting from like 2 days ago at night he's been replying to my txts and Facebook chat SO SLOW he's a reallllly fast tester too. He says he likes me obviously but idk it feels like he doesn't at all. It feels like he would do something behind my back, yesterday he never texted me and we havnt talked till 10pm then now it's 5 30 pm and he hasnt texted me the whole day and yesterday when we texted he said I love you to me and then in the midd if texting he never replyed back, whyyyyyyy... It feels like were growing apart not sure. If he likes mee...