How can you be so one sided

I never persecute D when he is doing his thing but when I'm completely open to him about who I write on FB or talk to on my phone he gets very mad and defensive. I hate it that he gets to talk to whoever he sees fit and the same rule doesn't go for me. I have nothing to hide from him so that's why I feel comfortable telling who I talk to, so does that mean he has stuff to hide because he never tells me anything. He keeps that locked up tight, it makes me think but I just don't give a fuck anymore. If he cheats on me then he just better not give me anything or I will break him into many small pieces, and leave. I hope that he will be man enough to tell me its over if he finds someone else, obviously it will hurt me to have him tell me that but it is what it is. We are both adults and sometimes our minds change on who we want to be with. Well while I'm on this topic, you have to be able to keep someone happy and respected in order to be able to call them yours. Treat them with respect. Treat me with respect.