I like him alot but idk if he gives a chizz about me?

i have known this guy since i was a freshman and he was a sophmore.i am now 11th grade he is a senior.we wudn't really talk at school much.(1 class together we passed a couple notes) and we started txtn naughty after knowing eachother for like 2 months.sometimes we still do.we have normal conversations too.but almost everytime he hints at something sexual.we have some of the same interests like punk rock and metal music.we both skate he has a skateboard i have a longboard.so that kinda brings us together i guess you could say.but...if i try to chat him up on facebook he answers in like one word replies or sometimes logs off when i sign in to fb.does this mean he doesn't like me anymore?