how do you know if you came or not

Me and my boyfriend have been having sex for two years and I don't think he's ever made me cum. Don't get me wrong the sex is good. But I guess my question is how do u now if u came or cum? How do you know if you had an orgasm.
    Is there an actual liquid that escapes your body? Or do you scream or something 😂!? Can someone describe it
Like I know that a few times I got super wet during sex and then we he kept going to where it was intense but pleasure able and I kinda got emotional and fell  asleep. It was amazing though. 

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