We constantly condition each other all the time. It’s a part of human interaction. We don’t usually do it consciously, but it’s conditioning nonetheless. Couples will subtly condition their behavior to be more in tune with each other.

Consider a simple example. Imagine a you’re in a couple, and you just moved in together. You’re both used to living alone. You’re used to flicking on the bedroom light as you walk into the bedroom before bed to prepare for bed. Unfortunately your partner tends to go to sleep before you. You wake them up a few times by accident, and they understandably grumble. You feel bad about it, as you care about them and don’t want to wake them up. You wince the next day when you see how tired they seem. In time, you stop flicking the light on before you enter the room. Your partner’s actions have conditioned you to not turn the light on. Your partner conditioned you without even intending to. We condition each other constantly. We observe what effect our behavior has on others, and we adjust our own behavior accordingly. We usually just don’t refer to it as “conditioning,” as that tends to have a nefarious connotation.