Trusting a girl that parties.?

I recently starting rekindling things with my ex. We were together 18 months almost to the day when we broke up and now two months later she's back in the picture. Now she likes to drink and party with her friends at on the weekends where there are a bunch of guys present. She's extremely attractive and the worst part about it is she's aware of it. Even with me back in the picture she still spends her weekends drinking. Not drinking socially either, but drinking to get trashed, and usually thewhole weekend. When I tell her she's disillusioned that these guys just want to drink with her as friends she throws a fit and says its not like that or that I don't trust her. To makes things worse her friends and even the part of the guys that actually knew me hate me due to her initial bitterness caused by the breakup. Not saying I didn't do anything wrong, but I don't drink or do anything outrageous so my nose stayed pretty clean after we ended things. I get the feeling theyre just being catty so I there's really no way of making the situation better for the Time being. As for the guys, they'll attack me no matter what the cirstances are because heaven forbid they loose another at their sausagefestivals... but like I said. She's disillusion. I don't know if shes messed up since she's come back to me, if she has then she been lying to me, and I know I'm not her keeper andcant tell her what to do.... I just want to know what the general consensus is. Do I trust her and keep her, or since ive already expressed discomfort with this to no avail do I mark this as disrespectful, cut my losses, and move on?