multiple orgasms

i have started seeing my new boyfriend and we have been sexually active for about a month now. although our sex life is great i have multiple orgasms in such a short period of time. my boyfriend has started questioning me and if im faking them or not. i have read up on multiple orgasms but all i was able to find was that alot of women cant orgasm during sex. i now feel like there is something wrong with me. i have not had the problem of multiple orgasms before and would really like to know how i can stop myself orgasming as much. please help me im stuck and have lost all confidance duringlove making. x carla