I am in a relationship, have been for about two weeks, yet I can't stop thinking about my EX. Im over her, she ruined me I would not go back to her, yet I may seem happy when Im laughing and hanging out with the new girl, who is the exact opposite of my last, yet each time shes gone I find myself only thinking about my ex. Does this ever go away? Its been 4 months since I was with her why is a part of me unwilling to let go