Need Advice On My Relationship Of 8 Months?

i need some advice on my relationship of 8 months. my girlfriend has been on a swinger’s website, i was ok with it because i didn’t know it was a social networking website until i looked into it. im not a swinger and she says she isnt but her friends are. she says she only uses the site to talk to her girlfriends. she has pics of herself on there and guys always message her trying to hookup. theres a guy that lives in my neighborhood that has been writing her trying to hookup and she told me he is a joke and laughed at him. i checked out the guys facebook to see if i recognized him, and my gf was on his friends list! it didnt make any sense, if she didnt want anything to do with him on that swingers website, why have him on a personal site like facebook?? she said she didnt even realize she just accepted everyone down the list. it sounded like bs. she said she didnt do anything wrong. if i was talking to other girls she would flip out. she said well i get hit on outside. i said thats different out side you cant control but online you can. i didnt like guys emailing her to hookup. so i told her i didnt like all this and was gonna break up with her over it. she said she would delete the site no stupid site is worth losing me over. she told me she DELETED the account and even lost money over it. a few days later I checked it out, and her profile is still there! all she did was block it from free members from viewing. i later told her about it and was pissed and ended it. she then kept saying she deleted it and even got a confirmation letter from the site stating the account was frozen. frozen? she was supposed to deleted it and she said she did. i asked the customer service people there and they said they dont freeze accounts. nothing makes sense. she kept saying she deleted it and i checked again and she blocked it from being viewed. so she never actually deleted it and told me she did. she has been trying to make me feel bad about this and finally told me she loves me and now were not together. she wants to see me soon to talk things over – should i not take her back? does this situation sound messed up?
also, she has been telling me the whole time ive known her that she hates her ex bf and how he never leaves her alone after dating him 4 years ago. she recently changed her screen name on instant messanger to “get rid of him” then i was over her house, and his name was on her buddylist. she would of had to add him to it, so that means she was talking to him. things never add up with her. she said he just popped up on there. yeaa right. what should i do?