Yea you should go ahead and tell her everything before things gets more serious. i know its a difficult thing but u gotta do wat you gotta do.  see in these kind a thing if you keep hanging here and there i am very sure its gonna harm your future offcourse. So u better go a head and tell her if she accepts be happy and live happy if she denied just keep moving don't let yourself down..Coz things will happen in our life the way it supposed to.

Good Luck