what do u mean impulsivity can include sex but not with everyone??

she is in treatment...she sees a therapist every week....we have LOTS OF LOTS of problems....we argue and fight over nothing 90% of the time....im really really afraid of being with someone who is unfaithful...i have past relationships that are the cause of that......the symptoms of BPD include....UNPROTECTED SEX....UNSTABLE INTERPERSONAL RELATONSHIPS.....what do they mean unstable? does that mean people with BPD jump from relationship to relationship?? they find a guy, be with him and then move on to another??

PLEASE PLEASE HELP....WE MAY BE PREGNANT AND IF SHE IS UNFAITHFUL I CANT B WITH HER.....I WILL TAKE CARE OF MY CHILD ALWAYS BUT I CANT B WITH HER....THIS IS KILLING ME....Somebody help....