Not offense man, but it seems like she is playing you. I mean if a chick is gonna mess around with you when she has a boyfriend, that means a lot.
You seem like a nice guy who values loyalty, and if she can't be loyal to another person what makes you think she will be loyal to you? I say cut if off now cause as others have said a HUGE shit storm will ensue the longer you are the this the bigger it'll be.
PSN ID: KingFate_