Search Results: bored and annoyed

This happened a week ago:
So i was in bed with my boyfriend and he was sleeping
I know all his passwords since we started becoming serious
So i was bored and curious if he's talking to other girls or whatnot
I went on his phone and looked at his facebook messages, his instagram and his phone messages
He mainly get messages from his co workers (both males and females) and his boys
With the females, he never flirted with them and all about work and stuff like that
Then he woke up out of nowhere and caught me snooping around his phone
He got really mad at me for it and said I shouldn't have done that and that he's going to change his password to his phone
Then this week, I wanted to see if he actually did change it and he did
He changed his freakin phone password!
I know this is not right but I don't know i wanted to see if he's cheating or not since my ex boyfriend cheated on me
Me and my boyfriend been together for 1 and a half years now and he has never cheated on me
But should i be upset with this?
doesn't this mean he doesn't want me to see anything? And he's hiding stuff from me now?
This week he got over it tho like he's not mad at me anymore - he still hugs and kisses me and all that shit
Im so annoyed and upset!
I feel like he's hiding something now since he changed his password? Or is it all in my head?