Is my girlfriend still in love with me+ is it normal that she says these things

Okay, so my girlfriend of 1 year has been acting off lately, she seems like a bit of a hypocrite and and i'm beginning to wonder if she's faithful/still loves me. (we are both 18) If girls could give me a bit of insight it would be great.

For example, she's been my facebook and looked through my archived messages, then shouted at me for flirting with girls BEFORE WE MET.

She calls me a man-whore for kissing like 7 different girls (nothing more) before we met despite the fact that she has had sex with 1 other guy and done oral with 2.

Recently i found some of her old IM history on her computer where she was dirty talking (it was really fucking disgusting shit too) with some guy (she was the reason they broke up) she also asked him to go skinny dipping with her, and to do stuff with her; and even though it was before she met me, at one point in our relationship before i saw it she told me about this guy and how he accused her of doing it even though she didn't (lying) like she literally came out with it out of the blue.

When we first me her friend told me how they used to do peep shows for their guy friends outside of her friends bedroom window, however she strongly denied this, then i saw in her diary that she did do it (and it led to her giving some guy a bj).

I won't confront her about it because i don't want to upset her, yet she will phone me up at ridiculous hours to have a go at me for chatting to some girl before we met. (not in an overly sexual way, just light flirting).

Recently however she has been acting very strangely.

For example i noticed on her PC that she had been checking out pretty much every girl i have ever spoken to on facebook, as well as looking at photos of this guy that she used to go to school with.

The other day she got really aggressive with me for saying i didn't want to get out of her bed, (we were watching a film). and she punched me in the face and body for refusing and made me leave the house, (i walked home with a bleeding lip.) Then later on she phoned me all contrite, yet when i tried to make my point she got extremely angry again and started mouthing off.

She told me the other day when i asked her for a hug that she "Hates making physical contact with me" and has told me numerous times that i'm disgusting.

I never hear a kind word from her anymore and she is always angry at me for something or other, however i am never allowed to say anything in my defense or i'll just get abuse. an example of this is whenever she asks my opinion on her hair (side fringe or full fringe) and i say side fringe, she will say something along the lines of "yeah i forgot you like fucking 13 year old emo girls" because i went out with a 15 year old girl when i was 17 for like a week; nothing serious.

Nothing i do is good enough for her anymore and she is always telling me to change, but i'm doing what she asks.

She doesn't get along with my family and she whinges about my little sister being a bitch, and how my mum is useless, yet i'm not allowed to say anything about hers (despite the fact that they are drug addicts, her dad used to beat her and her family, and they often have no money for food.)

Our sex life has gone; we used to do it 2 or 3 times a day but i'm lucky if we do it once a fortnight, then when we do she turns around or watches a dvd instead of cuddling.

I know i can be hard to live with sometimes and i'm often quite annoying, but recently she had just been treating me like shit, and i'm not sure what to do.

And finally; whenever i tell her i love her she will just reply with a mumbled "i love you too" or some just acknowledge it or say something that sounds like it, maybe just go make a noise that sounds like it.

So what the hell is going on?! is she still in love with me? is she cheating on me? What am i doing wrong? should i just move on?

Thanks (sorry for the rant)