Spielmans research, she found that people who feared being single were more likely to settle for less in relationships. She also found that people afraid of being alone will stay with unresponsive, less attractive partners. But fear of loneliness is not the only reason people accept less than what they deserve.

What do you call someone who settles for less?

sluggard: a person who is habitually indolent. goof-off: A person who is habitually lazy or does less than their fair share of work.