BOYFRIEND BEING DISTANT?

so latley my bf of 7 months hasnt been texting me as much, well we text hes just a lil less talkitive and stuff. and in school hes a lil distant, not as touchy and playfull and stuff like he usually is. oh yeh were 17. but when were together outside of school by ourselfs everything is perfect ... whats ur take on this? please help me