If you think your boyfriend may be using steroids, there are a few things you can look for. First, pay attention to his mood and energy levels. If he's suddenly more aggressive or irritable, it could be a sign that he's using steroids. You might also notice changes in his physical appearance, like rapid muscle growth or acne. Another red flag is if he starts using athletic supplements more frequently or begins taking new ones. Finally, if your boyfriend starts withdrawing from friends and family or becomes secretive about his whereabouts, it could be a sign that he's using steroids. If you're concerned that your boyfriend is using steroids, talk to him about it directly. Let him know that you're worried and ask him why he's taking them. If he refuses to talk to you about the issue, it may be time to end the relationship.