Vibrator/dildo- harm relationship?

So I bought a vibrator the other day.. It's about 4 inches long so could be used as a dildo too. Anyways, by BF and I used it while having sex the other day-- oh my goodness best orgasm I've ever had.. And it's so much easier to masturbate. But now my BF is saying things like "that better not replace me now" or feeling guilty that he can't get me to orgasm like the vibrator can... Any insight on how to go about implementing this new toy in our sex life? Thanks!!