'Alone' doesn't always mean lonely, and 'relationship' doesn't always mean happy. Being alone will never cause as much loneliness as the wrong relationship. If things don't feel right, take a break and spend some time with number one - You.
surround yourself with people who make you happy. People who make you laugh, who help you when your in need. People who would never take advantage of you. People who genuinely care. They are the ones worth keeping in your life. Everyone else is just passing through.