<human>: Provide a brief overview of the text.

Hi guys, this is the first time posting but just recently I found out that my boyfriend (20) had lied to me about how many people he has slept with.  Originally he told me 3 total including me, so only 2 others. However, it turns out that before me he had sex with a friend who came to him after a break up (her and her boyfriend got back together a week later). Now, am I being foolish for being upset? 

It happened a year before we met but I don't know why he wouldn't just tell me from the beginning.  I wouldn't be as upset if he just said it from the beginning to me. All I know is that he doesn't speak to any of the previous girls, however that doesn't stop me from thinking whether or not I'm as good as them. Another thing that bothers me is that I only know who one of them was (and she is super pretty, blonde, skinny, and cheerleader) so is it weird for me to want to know who the other two were just in case I were to meet them at a get together or just to know in general?
<bot>: Boyfriend of 1 year lied about how many people he has slept with. Do I have a reason to be upset or am I just being dramatic?