Love Advice

I am 16 years old. My boyfriend and I have been dating for 8 months. We never argue, we trust one another and everything seemes to be perfect. Today I logged on the facebook, and messing around I typed in his username. And to my facination I logged in the correct password wich let me activate his account. i let my curiosity get the best of me so I looked at his inbox and I saw messeges from him and a girl i know. They were flirting and it really botherd me. I confronted him about it and he said they have been friends like that for the longest time but nothing ever would happend.

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