My boyfriends ex girlfriend

My boyfriends ex girlfriend is now working with him. I'm like loosing my shit over here. And he's like you have nothing to worry about. And I'm like shut the hell up all I can do is picture you touching her and kissing her and now going to work with her everyday. Like can someone fucking kill me? I'm probably over reacting so I'm sorry if I am. I'm just having one of those really awful weekends.