Been in a relationship with my LTR for four years now. At the start she brought up the marriage idea in the future but I told her I wasn’t sure (I really wasn’t). Now I want to bring it up and let her know I definitely don’t want to neither kids so if needs be we should sever ties. Apart from the usual alimony cases and the fact that marriage odds are stacked against men, what points can I use to soften the blow in bringing this up and letting her know?