thats a little awkward.. it matters if your friend uses your phone.. check your bills and see if theres any forwared messages..

because I don't think thats possible.

My first thought would be that your friend is playing a prank on you. If he got your phone in his hands for a minute, he could have forwarded your texts to his phone and then claimed to retrieve them some other way. This is the only reasonable explanation to your question. Otherwise, your friend must be some kind of cell phone super hacker who doesn't mind violating federal laws to tease a buddy.

My Friend can read my Txt messages from his own phone, how is this possible?