don't judge me...

Don't judge me but yes.. My boyfriend finally gave me his password so that I could game on his computer and it turns out it's the same for all of his accounts. So did something that I shouldn't have done and looked at his snapchat, Instagram, Etc.. Everything is clean but on his snapchat, I noticed he deleted the entire history? Like I think he knows I know the password, because I saw the history. Then five seconds later it was all gone. Then I see he's messaging some random girl I don't know? All he said was "hey". That's it. I just don't get why he's talking to girls in general who aren't his friend or my friend, I just think that's weird. Don't judge me please, just tell me what you'd think in this situation..