Relationships can only be sustained by complete truth and honesty. the instant fear enters the picture, whether it is fear of losing the other, or fear of what the partner might think about you, you have lost connection with that person and your mind/ego is in the way. If this happens, you have to be completely honest with them and tell them how you feel, and recognize it is just your mind; an impermanent creator of dramas that are not real. "you" are not really real, your ego is just an accumulation of attachments to things that passed through your life. when you are willing to let go of these, you are willing to love; you are willing to share the present moment with your love, and be as one. There is nothing stopping you except your bodies, but you will be able to share everything with one another without fear. fear is nothing in the presence of love.