My bf asks if I cum every time...

So my boyfriend and I have regular sex, but after every time he asks if I came. I never orgasm during and I don’t know if I cum. It’s really weird but I get super wet so I tell him I did. I get orgasms while using my vibrator super easy though but never during sex. Our sex is great though. Does anyone have any advice or if the same thing happens? I have anxiety bad so I feel not as good as all his others and the only one like this! :(