Am I way to controling in my relationship?

[Sarahh]

so i have a boyfriend we have been together for 3 years got together in hs and i never thought i would be with this guy idk just want all that but ive grown love for him so anyways i cheated on him once he has cheated on me once that i know of that he did not tell me but others did and he confirmed it. well what is bothering me is that every single time i ask to see his phone he goes crazy like he doesnt even want me to touch it i feel like he is hiding something and it makes me not want to be with him its not just the phone it that instagram fackbook twitter anything he is like no why i dont ask to see yours am i just doing to much? he has giving me a reason to not trust him and so have i but anytime he want to know anything im honest about it.