6. It stops bothering him when you hang out with other guys.
“If the girl you love lives far away, you usually worry about that.” It can be a bad sign when he stops worrying about the guys you hang out with. There’s also the opposite approach, in which a guy deliberately acts jealous: “Wow, you really get along well with that guy at work, huh?” This lays the groundwork for a breakup under the pretext of stepping aside for your new love interest.