Most had only small increases or decreases in their oxytocin levels, but women whose levels rose significantly while remembering a positive relationship also reported having healthier relationships in general. Women whose levels fell dramatically while remembering a negative relationship also reported anxiety in their relationships. More research needs to be done, but this could indicate that oxytocin plays a part in whether we form healthy relationships or not.

Should we second-guess our relationships?
Yes and no. While we should always take a step back and make sure we’re with a person for the right reasons, we shouldn’t assume that just because we’re enjoying our sex lives that that is the only reason we’re with him.

“The oxytocin response is unconscious; it takes place within the autonomic nervous system, so it's hard to change it. But we definitely should be aware of what's going on when we feel this. Say you sleep with a man who's a jerk but a great lover. The next morning, part of you is going, ‘This guy is a prick.’ But another part of you says, ‘Oh, I feel this incredible connection with him.’ Well, that incredible connection is just your oxytocin talking. Remind yourself, he's not really The One—and keep looking until you find someone who's nice out of bed, too,” Kuchinskas says.