My boyfriend thinks im cheating on him but im not?:(?

well like we were texting each other and i told him that i loved him so much i wouldnt ever break up with him again( cuz i did 2 times ) & he said sure? your cheatingg onn me , go f*cking text your other bf and i said wtf ,Im not cheating on youu.! believee whatever you want thenn . he saidd Aightt & i said okay & he said weell byee go on and textt your other bf and i saidd ughh wtf like im nott cheating on youu! and he never texted back .. we go to different schools and i just cant tell him in person if we dont go to the same school. i love him so muchh ! what cann i sayy so he wouldnt think im cheating on him cuz im noot :(