The one?

What does it mean when you think about having a family or even getting married to someone else other than your s.o.?

I fantasize about what I would like my wedding to be like or how my husband cries when our babies are born, and I don’t see my s.o in it...

Is he not the one? I love him so much. I guess I just have a painted picture and I feel like he won’t be like I imagined.