My boyfriend and I have been going out for a year and 6 months. In the course of our relationship weve had a lot of ups and downs. Weve always found ways to fix things and at the end of the day we do. But lately we came across another issue. He doesnt want to have sex as much as we used to. Now it's just one time a week and I am usually the one trying to incinuate the act. At times he responds to it in a positive way. Other times he responds by saying his too tired to have sex or he's just not in the mood because he's stressed out. I really dont know what to believe. I tried talking to him but he tries to avoid things by saying that I always want to have sex. At times I think that he's lost interest in me because of all the problems weve had throughout our relationship other times I think he's just not as sexually attracted to me as he once used to be. What could be the reason for this?