There's a rush that comes with the beginning of any new relationship, Hood said. Over time, that euphoria can morph into intensity — the first warning sign that a relationship is unhealthy.
"It's not how a relationship starts that matters," Hood said. "It's how it evolves." A few markers of intensity, according to Hood, are when a partner begins incessantly calling, texting, or showing up places.
Intense partners can be impatient when you're slow to respond to their messages. They might also say "I love you" sooner than feels natural.
If a relationship feels like it's moving too quickly, or starts to become suffocating, it might have veered into unhealthy territory.