Been with my girlfriend 6 months. Is she cheating?

Lock on her phone, sleeps with it under her pillow. gets texts all night long. gets angry when i look at her phone while shes texting. comes home with her hair all messed up and jumps directly in the shower. disrespects me when i ask her questions such as " where were you, who were you with, is there someone else? Leaves anxiously after texting and says shes going to her moms. When i attempt to break up with her.....she cries and tries to talk me out of it. Apologizes for being a ***** and such. Constantly telling me i'm a liar, an asshole, and all i do is go to work, buy her stuff, while she sits on her *** all day eating my food, using my computers, and laying in my bed. Has hung out with at least 6 different guys in their houses, rooms ( she mentioned finding something in the guys closet) just in the last week. She got mad and disappeared overnight last night claiming that I neglected to give her gas money as promised so she couldn't make it back to my house, but immediately thereafter proceeds to tell me that she has driven at least 5 times the distance. and that she is now stranded wherever she is. calls the next day telling me i'm an asshole, that I obviously dont care about her, etc. etc. because i didn't text her all day. These are some seriously messed up games. I'd appreciate it if a rational female could help decipher them. Its really easy to assume the worst, I'd like a more educated approach. Has a picture of another guy in her phone. Has been talking about him almost nonstop.