What should I do if I find that my boyfriend's mobile phone has ambiguous messages of the opposite sex …

Pay attention to his recent movements first. If there is a mistress, ask her directly. If she is silent, she will break up. If she admits her mistake, she will be given another chance. Faced with such a silent man, he is thinking that you are still a mistress. In the face of a person who wants to correct his mistake, you might as well kick him away first and give him a chance.