After a handful of underwhelming relationships and dozens of disappointing first dates, Andrea Vorlicek recently called off the search for a husband. The 29-year-old always thought she’d have found her life partner by now. Instead, she’s house hunting solo and considering having kids on her own. “I’m financially self-sufficient enough to do these things myself,” said Vorlicek, a Boston-based accountant. “I’m willing to accept being single versus settling for someone who isn’t the right fit.” She sees her plans for an independent future as making the best of a lousy situation. “I don’t want to sit here and say I’m...