[header] How to tell if someone is your friend [title] Reflect on how you treat one another. [step] Friends are typically loyal to one another, meaning that you shouldn't reflect back to countless occasions when they have betrayed you, and vice versa. It's hard for two people to be friends and not ever let one another down. 
But, betrayals shouldn't be standard in the relationship. [substeps] If this person never talks about you behind your back, spreads rumors about you, or disappoints you repeatedly in other ways, they probably are your friend.