You need to decide who is leaving for good. You cant live together anymore so one of you needs to get your own permanent place and you do need to go no contact. Dont beg or tell her you love her etc etc. Let her go.. she may have a little rebound, realize shes made a mistake and come back or she may just move on altogether.. either way it needs to be her decision. You cant force her to come back and anything you do to try and win her back will just push her further away.
I suggest you move into your own place-get a flat mate and let her move back there if she wants to. Then ignore her. Give it a few months-she may come back.
8 years is a long time-maybe shes confused, having doubts etc but it is possible shell come running back if you just give her some time and space to miss you.
Im not saying you should take her back if she does. But you can cross that bridge if it comes to it
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