Is this girl leading me on? im soo confused and need advice!?

Hello everyone,

Basically ive found myself in a bit of a sticky situation in which i'd really appreciate some outside third person advice (not friends/family) but someone who can look at the situation as a whole and tell me what to do (you guys!).

Ok so i've been seeing this girl for around 2 months now (around 1 month serious)! We get on really well, we speak from literally 8am until bedtime every night (on blackberry messenger, its an instant messenger on your phone), we talk on the phone alot and at the moment we see eachother around once or twice a week, we usually get something to eat together, go to the cinema and then usually end up at mine were we kiss, have a cuddle and a bit more (not sex yet). So obviously im growing quite attached to her, and i believe she is me too (?) she usually initiates the conversations too! We've grown really close and i know shes attracted to me as when we're together we're very intermate, kissing etc!

Ok now the twist... Basically around 3 weeks ago she said to me "ok i know we're seeing eachother now, but i need to tell you something, basically im in a really bad situation atm, i was seeing a boy for around 8 months, he was never my boyfriend, but hes part of my friendship group, so i see him most weekends... We haven't done anything for around 3 weeks, but i just need to let you know because sometimes we still do stuff together, and i dont want to get in trouble for it, i really dont want this to change stuff between us"... Of course at first i was really taken back, like i felt insulted and upset, but i replied and said "Look, you know i like you etc, but we're not boyfriend and girlfriend so i can't tell you what to do etc, i just hope that if things with us progress, you put a stop to this so we can continue with things" and she agreed etc blabla.

Anyway around a week and a half ago i was out at a club with a few of my friends, and she was there with her friends and of course the EXboy, so when i did speak to her she was acting a bit weird, it felt liek she was looking around to make sure he didnt see... we kissed a few times etc and she kept on wiping her lipstick off my face! Anyway after we went outside and had a talk to which i said "look whats going on etc" and she said "im just in such a bad situation, hes always there because its my close group of friends so i see him soo much, i dont want a relationship with him, its just sex! I dont want to be with him im just in a really bad predicament atm", so i told her "look im not gona whine and dine a girl and treat her like a princess if shes ******* another boy" and she was like "yeah i understand blabla, im gona try and stop it i really want too".

Anyway i went a bit distant the next couple of days to which she messaged me more than ever, just making conversation, until one night i told her i couldnt do it etc and that it wasnt fair on me". "She then replied that she was upset and that she wishes we could sort something out because i am the right option". ANyway the next day she messaged me like "cheer me up, i really wana see you right now etc" So we started talking again and seeing eachother from there!

Anyway basically im at that stage again where im just doubting everythimg, i really do like her and shes a lovely girl, but i just cant handle her seeing someone else, i have too much pride to be mugged off liek that, i dont think she has slept with him for a long time but how would i know? I just dont know whether its time to cut the strings before i get hurt? Or is there any advice you guys could give as to how i could make her just realise? I know how the human mind works... we always want what we cant have etc... The most frustrating thing is, i know she likes as when were together shes very intermate, and also she talks to me ALL THE TIME, so surely if she didnt she wouldnt bother? What do you guys think?

thanks in advance!