Hmmm....My mom used to tell me..."Those who point their finger to blame are the ones who hide in shame".

Over the years of living life and having my share of various encounters, I have come to discover that the statement is true.

For starters, NO ONE should disrespect another. Violating your privacy as he does only proves that he has no concern for your feelings and that he has no respect for YOU. Shame on him!
And the fact that he is accusing you of not being honest or devoted (when he has absolutely no reason to feel that way) is a good indication that he very well may be acting out of guilt.

Has he ever asked you to stop being friends with anyone (male or female friends)?? Does he seem to always have reasons why he thinks a specific friend of yours is harmful or threatening to the relationship you have with him?
If you know that any of your friendships pose no threat to your relationship and he insists that they do (asks that you forfeit it for the sake of the relationship's security) that should indicate that something is not quite right. Be certain to ask him to justify his reasons for his suspicions. His reasons should not be centered around himself, (which more than likely just may be). Never sacrafice your friends for the sake of his insecurities. The only thing that will do is eliminate one more person that he feels paranoid about and reinforce him to act the same way with the next friend...then the next...and even the next. Before you realize it, you have no more friends of your own.

Does he have female friendships that he maintains? If so, does he feel he needs to hide them from you, or does he express them openly with you?
Have you paid note to his activity online? Who he talks with....how he behaves when you are nearby. (Do you have HIS passwords to his accounts?) When he receives activity on his phone (texts or calls), does he remain in the same room with you, or does he wander off for privacy? Does he ever leave his cell unguarded?

There are many signals which may indicate what is going on with him that you are completely unaware of. Because you are trusting, you have no reason to suspect deceipt (not saying that he IS deceiving you...just a suggestion).

Also~change your passwords to your online accounts to prevent him access. If he questions why he can no longer access YOUR accounts, tell him that your tired of being treated like you are doing something wrong.
(But more than likely, the act of you changing your passwords to prevent him access will only lead to him accusing you of having something to hide...such unnecessary nonsense...how exhausting!).

And please know that I can very well be wrong about him, (and I hope I am as I know you love him and this is very difficult for you). But from the information which you offered, it seems to me that he is a possessive person striving for control.
Never sacrafice your identity for the sake of another!

I'm hoping for the best for you. Take care.