Sould I be suspicious of my boyfriend who is carrying Levitra around with his other usual medicine?

about 2 yrs. ago my boyfriend started taking blood press. meds, and he began having erection problems ocassionally,so we went to the Dr. and he was prescribed levitra. He has not taken any, they are all there, however there have been times when he needed to use one with me and he made no mention of having them. It has been so long I no longer thought he had them. He had some other samples of viagra etc. which we used once or twice and I don't know where they have went to, he says he dose'nt know where he put them.