My DP has been open from the start of our relationship that he doesn't want to get married. His parents never married (now separated) and pretty much no one in his family is married and he just says it's not for him. I was married and divorced before I met him and I wasn't too bothered about remarrying, particularly as DP has children from a previous relationship and I had more assets coming into the relationship than him and I wanted to make sure that what I had earned went to my own children.
Fast forward some years. My DSC have come to live with us full time, DP and I have had two children together. Where we live wraparound childcare is non-existent/very difficult to come by, I'm currently on maternity leave so right now we're fine but we will need to sort something out for my return to work. There are nurseries for our younger shared DC, but no wraparound childcare for DSC. After discussing our options it's looking like one of us will have to give up work or go part time and as DP earns double my wage it makes sense for it to be me. However I do not want to (and nor will I) give up my job or go part time if we are not married as I know I will then be in a very vulnerable position. So far when I've raised it he's said that I've always known he doesn't want to get married, which is true bit our situations has changed now. I find hard to explain why I now feel I need it without it sounding really grabby and like I'm after all his money but the reality is that if I stop working or go part time then my earning potential will be diminished. If we were married then I would feel like our money is properly shared regardless of who earns it and if things went tits up then I wouldn't be in as vulnerable a position. It feels so unromantic to want to marry to feel financially secure but having already been married, marriage itself has lost it's romance for me but practically speaking I think that in our situation it's important that we are married.