My husband is distant

Dear Gaone Please keep my identity anonymous. I just got married and the future looks bright with my beloved. Nonetheless, I have noticed that my husband becomes distant at times without any reasonable cause. Perhaps I am not in not in a position to accurately say he has changed because being married to him and staying with him full time is totally different from dating and seeing each other occasionally. Honestly, this scares me helluvah. Whenever he is distant and I ask what is wrong he just says ‘nothing, I am just relaxing.’ I am not sure what to think. Kindly advise.