Decision time has come

Do you ever really know that the marriage is over?  We have been separated one month and my husband is refusing to continue the separation.  He says he's moving back in by March 1st and "we will fix it" (marriage).  I'm nauseous right now knowing that he will be there when I get home tonight to insist that I fall in love with him again.  I'm trying to write this without a bias against him because maybe he's not the way I think he seems.  (that probably didn't make sense).  But I know (and he knows) that I'm not in love with him anymore and really have no idea how to gain that love back.  I don't want him back in the house and honestly, neither does the rest of the family.  They are much more at ease with our current arrangement and he has carte blanc on seeing them whenever and whereever he wants.  There's history that my children either know or suspect and they don't feel that I should be with him for their sake only. 

Bottom line, is that I should finally ask for the divorce tonight but there's still that doubt that I haven't tried everything yet.  I have asked for a divorce once and after six hours of "discussion aka interragation" I stop the petition.  I am anticipating the same this time and really would like to feel strong enough to stick to my decision. 

Bottom line is...Do you ever really know when the marriage is over?  How do I trust that I'm making the right decision?