I wouldnt worry too much .
If its just general chuit chat then its fine .
But i do know how you feel .
And you wanna know everything theyre saying , cause to you its a big deal.
I do know how you feel , but at the end of the day you just have to trust him .
And at least he told you and showed you it ,
I dont think he kept it a secret from you i just think he classes ut as every day chat.
I mean if it gets to be anything mroe than that then you need to stop it before you get hurt.
And if he starts sneeking around then i'd ask him ,
My boyfreind got chatting to someoen online , and then he eneded yp cheating on me with her .
But he did'nt tell me what he was doing , i just found the chat log one day .
Just keep an eye on things .
:)
Good Luck