<human>: Can you summarize the given text in a few sentences?

We recently had sex and I lost my erection during. Afterwards she brought it up, saying something to the effect of "I don't even want to have sex if I don't think you can finish it." Now she's been passive aggressive since it happened a few hours ago and it makes me feel so frustrated and ashamed.

I tried to tell her it wasn't helpful to focus on it and it'll just make it worse for me, and she got angry and took the attitude of "fine, so if I feel sad about something I should just keep it to myself?". I don't know how to respond to that.

This is the first night of our hotel getaway and I just want to get past this. Any advice?
<bot>: Girlfriend is upset with me for losing my erection during sex, I don't know how to talk to her about it.