5 year relationship

Me and my SO have been together 5 years , I've always discussed highly of my future plans on wanting marriage and sharing the same last names as my kids and partner showing my kids the importance of commitment when you love someone and after year 2 he told me he did want to marry me yet he never asked here we are now at year 5 and he told me he never wanted to marry me and never plans to.... I still want to get married one day ... we have 2 kids together live together so I just give up my whole life because of something I want would that be selfish?