she seems to want out, and its not really right for you to deny her that. Your best course of action would be to try to have a level headed discussion with her, and calmly let her know how you feel. Get her to level with you and if being with this other guy is what she truly wants, then you need to walk away. On the other hand, if she isn't sure what she wants, then you may not want to cut off all ties, but be very careful not to let her string you along. You're basically walking a very thin line in a break like this. You don't want to turn yourself into a perceived threat, as it will only make your problems worse, but you also don't want to be too quick to cut her out of your life if she still has feelings for you that could leave you with a second chance.