10 Signs You Could Be in a Toxic Relationship, According to Experts

Applauding and supporting one another's achievements is a sign of a healthy relationship. But when your relationship is toxic, your partner can't bear to see you succeed, Lawless notes. "They may belittle your achievements or even sabotage your success," she says. "The 'resenter' will look for ways to minimize one's achievements, even minor ones. This stems from a deep insecurity, but they will come across as though they are superior in everything."