If you're wondering how to tell if a guy is really hurting after a breakup, there are some definite signs to look for. First, he may withdraw from all social contact and become increasingly reclusive. He may also lose interest in things that used to matter to him and start neglecting his appearance. Additionally, he may turn to alcohol or drugs as a way of numbing the pain. Finally, he may become fixated on the idea of getting back together with his ex, even going so far as to stalk her or make repeated attempts to contact her. If you see any of these behaviors in your guy after a breakup, it's clear that he's not handling the situation well and could use some support.