There's "togetherness" and partnership, and then there's being so needy and codependent as to be mentally/emottionally unbalanced - sorry, but what you fantasize about sounds like the latter aand very unhealthy. That kind of relationship is something I would want to protect someone from, not to encourage. Jeez, it's actually little scary, like some kind of imprisonment situation. These thoughts you have are simply irrational and not what a healthy adult would want. Have you considered therapy?
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein