Well, if you check the laws in your location, then you might see it would be to the benefit of your daughter.

I personally believe it's better for people in a long-term relationship to be married. If you don't even care about whether you are with him or not, then why are you even together? I think you need to be honest with him, if you really don't care to be legally married. It sounds as if you want to be free to move out of this relationship at some point, no strings attached. If this is the way you really feel, then I think you would be doing him a disservice by going along with it.

I suspect if the "right guy" comes along, then you might feel differently about a piece of paper.