Okay so pretty simple problem, my girlfriend is too secretive. We are both 17 and in grade 12, we are in my English class, and she is leaving early to buy some drugs so she asks me to leave class with her for a bit just to say "bye". I walk her to her locker and on our way there we talk about random stuff, eventually somehow we end up at the discussion on what she did this "monday."
So on sunday she told me she's doing stuff and she can't hangout, so I'm like sure all good. Well guess what this fucking stuff is; it is watching a movie with another (friend) guy at her house, and watching a movie at her house involves laying on a bed that is maybe 50cm thick. Pretty much this pisses me off, this is the second time where I found out that her, "doing stuff" involves hanging out with a guy alone. Next of all, why the fuck does she not tell me that?! Like at least be honest with me so my mind doesn't have to be haunted by the possibility of getting cheated on.
I asked her to be more open about these things, and she replies "I'm not gonna tell you every little detail about my life," and that was that. Sure she says that she didn't cheat, and what not, but how can I trust her when she can't even tell me something like that when I asked her to tell me before (plus words are just words), like I wont get mad if she doesn't tell me. She's a beautiful girl, but like we haven't had sex for a week or two due to time constraints, and I know her horny personality... And we all know how manipulative some guys can be, so I think I have every reason to be worried.
Anyways, I'm asking teamliquid for advice, please refrain from posting if you haven't experienced similar situations, or at least make an attempt to sound experienced if you wish to help. Don't mean to be bitchy but I'm just not in a good mood after today, but "Fuck her then dump her", is not the kind of advice I'm looking for. Thank you (: