It's just this one person, this one girl, that I'm afraid of. I'm afraid they've done stuff, I'm afraid that they lie and that I'm just naive ... I go crazy about this. I obsessively check her profile, her friends' profiles, I legitimately lose my mind over this scenario that I created in my head.. And I can't dig myself out of this. The situation has been hectic, there were fights about this, with the girl actually involved, where she actually did try to convince me that my own boyfriend liked her.. But, her lies became an infestation of my brain, So here I am, after the situation is long ended and my boyfriend dismissed this attention-seeking, lying, family friend - and I can't untie the knots in my head over the idea of being cheated on. Help?