There's a quote I read online transpires me and I find that is something we all can relate to by nobody else but the great Oprah herself.
"Never look for someone to complete you. Be complete on your own. Then when you find someone to share your life with, they don't become your whole world, they just make yours a little better."
A relationship whether it's a friendship or a romantic relationship should not have a party that is fully dependent on another person. How that person acts and reacts should not affect your own happiness. Of course, it's always about the romantic relationship.
If you are that person that says "I need to have a partner and I cannot live without one" is best that these people start reflecting. When you get into a relationship, the focus should not be on that person and only that person. If you do, your world will go crumbling down anytime as you do not have anything to fall back on.
It has been proven that we all should have a balance life. You should have your own interests, and personal space. Otherwise, imagine the horror awaits you when that person leaves you.
If you have your own life, a complete you, there's nothing to worry about. It's always good that you look into your life first, complete yourself before having someone else in your life.