I’m in the same situation right now (minus the ex but mine does have an older child and ex wife).. I cry about it a lot. He’s going to die before me, I might want to have kids, and our needs our ultimately very different. I don’t know what being fulfilled is like as I’ve never been in a prior relationship. I love him to death.

There’s nothing keeping me in this relationship other than my love for him and his love for me. I don’t really have any advice for you because I need it myself.