Boyfriend help...what should i do/what does this mean?

so me and my bf have been going out for a little bit over 9 months, we rarely fight and we have never cheated on eachother and thats the one thing ik neither of us would do to eachother. so we hung out this weekend like we always do (thats the only time we see eachother since we go to different schools) and everything was fine we got in a minor fight bc something about him always following his friends and never being able to just wait for me idk but we solved it it was back to normal and we m.o kissed cuddled the usual and b4 i left he said ily to me like always so it was all good, but suddenly ever since sunday over text he seems very distant, like randomly he'd respond to w.e i said then say brb n nvr txt bak and he did the same thing today and he still hasnt sed "back" now im not an ocd txter wit ppl like "r u there" type stuff but im starting to feel like something is up; granted he never texts when hes doing hw, but still its been like 5 hrs, do think somethings up plz help idk wat to do and i dnt wanna juss sit here waiting in fear that hes gunna hurt me...thx