bf probs

me & my bf r together for like 5 months. We r at the same school. At first everything was perfect af. We were together at breaks & were holding hands while walking together & stuff. at chat he was very enthusiastic & was writing like 5 paragraph texts for gn & gm etc. But now I feel like he's bored of me. We aren't walking together at school at chat he talks "neutrally" & he doesn't tell me he loves me very often & when we date he's not so romantic & he always want us to have sex. I talked him bout it he said that he's pressed from studying & that nothing has changed but idk. 1)What d u believe? 2) What should I do?