Hello.
I don't understand your question because you haven't written clearly about just what it is that happened that has you confused. I'm going to take a guess: Are you saying that when your girlfriend stopped stimulating your penis, you didn't have an orgasm and that's worrying you?
Why would you worry about this? If you were turned on enough to be secreting fluid, you were close to orgasm, and then when she stopped stimulating you, your body stopped responding, which is quite understandable and not indicative of anything amiss. Please stop worrying yourself about nothing. Dr. J
I did think this but I'm not sure. It would make most sense but something's telling me it's not this.
maybe she just gave up before you finished
I'm male by the way, even though it says female.