 So there's a few ways to know if someone is a right fit for you in some sort of relationship, whether that's a romantic relationship, a friendship, a roommate, a job, a boss. Whether you have a five-minute or a five-hour phone call with this person, how are you feeling after? Do you feel lighter, happier, appreciated, loved, valued, understood? Or do you feel sad or frustrated or annoyed or angry or anxious? It all comes back to, well, what do you want out of these specific relationships?