A healthy relationship keeps the doors and windows wide open. Plenty of air is circulating and no one feels trapped. Relationships thrive in this environment. Keep your doors and windows open. If the person is meant to be in your life, all the open doors and windows in the world, will not make them leave.
I have lived this and I will never waste time like that again. Time you can never get back. And you can feel so alone even when you are with someone. I would rather be alone then lonely with someone else. You should never feel that way in a good healthy relationship.