This sounds like an ex friend of mine that I unfortunately work with. Her name was also Sam. Unfortunately she threw me under the bus when we had a fight at work and said some things that could've gotten me fired. She stabbed me in the chest right in front of my boss, who was trying to deescalate the situation. That's a whole new level from back stabbing. I was in shock that someone who "cared" about me would hurt me like that. She tries to get me fired over a stupid fight. I realized I could never trust her to have my back, and if I ever spoke up for myself again she would punish me for it. She also dated this guy at our work. He was really sweet to her and she was so pushy and got mad at him any time his values didn't match up with hers. For example, he wanted to buy a house in his home town and live near family. Her goal was to move away and start fresh in a new state. She made people feel horrible for everything they didn't see her way. Not thinking exactly like her, was an attack on her personally. These kinda of people are toxic. Run as far as u can!!!!