Okay i've got a problem with my current girlfriend?

okay i've got a problem with my current girlfriend, i know i'm no angel myself but she wasn't brought up like me (a law bying civ,bible parents, hard working, against the cuts etc) it all started about 2 weeks ago when she left her bedside draw open 1 night when i was sleeping over, i looked in the draw (it's where she keeps the condoms) there's a prono mag. i decide to leave it grab a condom and met her in the shower. the next few days it bugs me so i take a look there's a few in there with nuts,zoo,loaded, fhm, etc i take a look though and there's my girlfriend in the mag, she was in everyone, j18,razzers etc there was even a tape (8mm) mark first appearance (it's obvious what it is haven't found it online yet but i'm not really looking for her it's not under her name) anyway turns out her friend introduce her to it when she was in college and she needed the money. she's been doing it every year since she was 18 (she's 22) i confronted her about this she said she was just doing it for the money. i was okay halfly with that but it when it lead to another, she caught me flipping though the 900 chanels on my t.v. at home later that week, while on the subject she goes i wonder how much they get paid, can't be much i said must be pretty boring waiting for a call, she said i wonder if they would let her bring a ds or psp. i said probably not anyway yesterday morning the subject comes up again she tells me i can't sleepover thursday the camera's coming. i said what she said their coming to take nude pic's i need to be out, i said what again she goes it's not like there having sex with me it's just nude pics, she when looks at me with that look the not understanding how i feel about her and she thinks it's okay look. i say don't you feel violated guiltily about havinging a prev look at you and etc. it's not the worst thing i've done she said whats the worst i asked erm i sept with my corner store manager for a 2.50 an hour raise (in my head i was against the wall bashing her head against it etc) (she still works there)she when goes don't feel to bad i'll buy you something they usally pay in cash. which lead to another point all around her room plus some underwear are expensive things is this how you pay for all this i said well yeah i can't put it in the bank i would if to pay tax on it and they would know how much i really make a year. i can't come back from this i sit there while she gets ready for work and disappears, so i'm left with this do i end relationship now cause of this or do we carry on. after all i'am a 25 year old who still lives with his parents and plays a childrens card game (yu-gi-oh) i'm porbably not going to get another 22 c cup quite fit bird. but the feeling in my gut tells me it's only going to get worst cuase she can't just be dating me cuase i'm funny,cute, a bit overweight, kind and smart, etc can't be cuase i'm good in bed i've only done it about 20 times but when i do hold out in foreplay. don't brother asking for more info i got her about a month and a half ago defending her from a drunk in a pub a swift kick to the balls followed by the d.t.t. hold with an headlock until police come works better than a right punch to the chin.