Confusing Relationship

Me and my SO have been together for 10 months and I really love him, but im not sure he feels the same anymore. He hardly ever texts me anymore, like he doesn't even say he's busy he just doesn't text for hours. And about 2 hours ago i texted him and he didnt respond for an hour but he was posting on his social media and then when I texted him again he said he was sleeping. I get he has school but he doesn't text in the morning or when he gets off. When we hang out together he pays attention to me and stuff but it seems like he is always mad at me or something, i don't know. Every time I ask him about it he denies it. What do you guys think?