How to prove your not cheating?

k i have a bf and he thinks i cheating and i not i have texted a nother guy and was trying to get him to send pic of him to me and i said ill send pic of me to him but i relly was just going to trick him not send pic and make him had and so he will not talk to me i sent a text to wrong person that said you send one i send one went to friend unsteded of guy that it was meant for and it got to my bf and he will not belive me bout me tricking the guy he thinks i cheating he said i am not mad at you i never was just wondering if you were so we went to bus and he said you still on thin sheet of ice you know that i said why he said just kiding i said k i love you we kissed he got on bus to go home and i went to schoool where my mom teaches to go home and i was needing your opinon on how i prove i was not cheating and by the way phone is taken 2 weeks got grounded and hi cant have back and i deleted all text on phone but friend knows the guy she is friends with him to and she going to tell him to leave me alone he is hurting me and my bf relationship i need to know how exactly i can prove i not cheating on my bf