Everybody isn't your friend. Just because they hang around you and laugh with you doesn't mean they're there for you. Just because they say they got your back, doesn't mean they won't stab you in it. People pretend well. Jealousy sometimes doesn't live far. So know your circle. At the end of the day, real situations expose fake people, so pay attention.
This also goes for an emotionally abusive parent or friend, not solely for boy/girlfriend or husband/wife. For those who are suffering by the vile hands of such people, I pray God and Jesus will have mercy upon you and rescue you... no matter WHO you are.