me and my boyfriend have been together for four years. when we first started dating we had sex alot now he never wants it. he always says later and never does it. im 18 and hes 23. hes still young and should want to have sex. he always says hes to tired or isnt feeling good. we moved a year ago across country but this has been in the last 9 months. i dont think hes cheating because he works during the day and never goes anywere at night unless its with me. i just dont know what to do i really love him but we only do it once a month if even that. please give me your opinion on my situation. thanks!