<human>: Okay so we've been dating a year and a half now, started having sex at 6 months. I am her first time for everything but I have had previous relationships. She is the most attractive girl I've dated and my longest relationship to date. Last night we we're getting ready to have sex and I couldn't get it up properly. This has happened to me once or twice before but has never been a problem because it was up properly in a few minutes. This time though, I didn't get back into the mood and nothing happened. I've explained that this is nothing to do with her and that it's happened before so it's just a fluke, but she seems to have taken it quite personally and believes I'm growing tired of her. Any advice as to how I can show her I'm attracted to her. So far all I thought of was declaring loudly the next time I have a boner "See! There's nothing to worry about" but that seems a bit tactless.

Summarize the given text in a few sentences.
<bot>: Couldn't get it up and girlfriend took it to heart. How do I show her I'm still attracted to her.