Well, it’s normal for you to have this idea, but you’re right, you’re overthinking it. Maybe your boyfriend really thinks you're working hard, so he wants you to rest more when you go home, so he specifically asks his mother to call him? Because you usually sleep together, it’s impossible for him to ask his mother to call him without you calling him, right? If this was specially arranged by your boyfriend, then your boyfriend is very considerate of you. You feel your privileges have been usurped because you are used to this behavior. It’s okay, just treat it as a holiday for yourself