There can be a possibility of your husband cheating on you, and are many ways of finding that, like he doesn't show interest in any family affairs, and is completely lost in his world. In such a case, you should try and stay calm; because you don't have any proves to show he is cheating on you. You never know many he has other issues like office issues.
You see every relation is based on trust, whether that relation is of a mother and her child, or of a teacher and her student or whether a husband and his wife. If you have faith in your husband then all your doubts will be cleared. And you never know maybe you're assuming all this. If he loves you and your family, then there is no way he can be unfaithful to you. So have trust on him and your relationship with your husband.