Orgasm??

My boyfriend has never made me cum and he thinks that he makes me do it all the time. The thing is he's the only man I've ever had sex with so its not like I knew what an orgasm felt like before I made him believe he had the ability to me me orgasm. When first used a vibrator I experienced it for the first time I just don't know how to tell him that over this whole year I "faked" every orgasm.