You get him girl... You can go to the providers website and get in on his account assuming you know the information to do so and read every one of them. Or wait till he's in the shower and read very quickly..... In his phone. That's one of the places he wont take his phone with him.... Or wait till he's sleep ing and grab that sucker and go through it..... If none of these are possible you must be a younin and then it don't matter anyway cause your getting to serious and scaring him away, back off and you have any problems.
Wow... If you don't trust him you probably should be out of that relationship NOW. Ask him if you suspect that he's cheating... Don't read his texts. That is totally inappropriate.