Why didn’t I get back up?

I don’t understand it guys . Last night me and this shorty that I met a few months ago at ihop linked up in my car to smoke. Now we usually always smoke together in the car or by her job after work when she gets off , but last night things were a bit different. After the smoke session we were just talking and flirting with each other (as usual) , things lead to the next, we start making out , she starts giving me oral, like really deepthroating the shit out of my dick, as she arises , I’m still hard on go ready to fuck… I tell her to take off her clothes so we can yk do the do… as she’s takin it off we’re jus giggling a bit about the moment and what finna happen I guess… next thing you know I tell her to get on top ( mind you we’re still in my car) she get on top and the INEVITABLE HAPPENS . I start to go down… like getting soft in the midst of her taking her clothes off to trying to put it in. After this I start worrying but trying not to to try and get back erect. She says to me it’s no need to be nervous , makes out with me again and even tried to give me head again. And nothing worked . I did not get back hard to penetrate her. I felt like my night was ruined & I utterly wasted her time. I cannot justify why this happened and it’s just makes me not even want to talk to any other females, please guys help me out! Im a 23 year old male, it’s no way my penis is supposed to be malfunctioning like this 🤦🏽‍♂️! I need answers !