My ex boyfriend and I recently had a talk and agreed we missed each other. His friend and I started hanging out and likes me and once I told him about my ex boyfriend he told me that my ex talks bad about me. I know he used to talk bad about me but I'm not sure if he recently did. I kind of feel like his friend that likes me is just telling me that so I won't go back with my ex boyfriend. Any advice on what I should do?