Yeah... this is about breaking up too. He's thinking back to before they were together 'I never needed anybody..., it won't change now." He keeps saying he's fine when he's anything but, he's trying to forget about things but he can't stop thinking about her. The part starting with 'P.S. if I may ask why' is about her new love. She's in a relationship and he's asking her (and himself) why they fell apart when they tried so hard.
Yeah... this is about breaking up too. He's thinking back to before they were together 'I never needed anybody..., it won't change now." He keeps saying he's fine when he's anything but, he's trying to forget about things but he can't stop thinking about her. The part starting with 'P.S. if I may ask why' is about her new love. She's in a relationship and he's asking her (and himself) why they fell apart when they tried so hard.