Idk if i should leave or stay in this relationship?

it'll be hard to continue the relationship knowing the fact that she still talkin to a dude that is still in love wit her. U need to give her an ultimatinum its either her ex or u. If u know someone is in love wit u then u wont continue talking to them unless u want something to happen. Cuz even if they're jus casually talkin..if she sneaking around doin it then it'll seem like it jus more a "casual" talk. But i say if she continues to act like that and sneak around then u need to break up wit her cuz obviously she doesnt know wut she wants