am i overreacting? HELP?

[Eabha]

okay so two years ago i met my now boyfriend on the internet, i loved the way he talked to me, so friendly and chatty and i assumed he talked like that cos he liked me.. well he left his twitter logged onto my ipod and i got a bit nosey and checked out his messages, there was many messages to other girls, some girls even sending him kisses and hearts and calling him sweety.. his password is now changed on twitter so i dont know what it is.. i want to confront him about it but how do i without him knowing i was on his twitter?? its really bothering me, am i overreacting? or have i a right to be jealous?? the way i see it is if he went on my twitter hed find nothing and i wouldnt feel the need for him to not know my password... was it wrong what i done? HELP