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

On a Thursday night my girlfriend (let's call her Sarah) and I go to dinner. It takes us a while to walk back home because of a snowstorm, it was one of the coldest days this year. We make it to my apartment and promptly jump each other, making out for a solid 20 minutes. Only then do I notice a mild iron taste in my mouth. I pull away and see my girlfriends face covered in blood!
I promptly freak the hell out while she keeps yelling "what's wrong?!"
She goes to the mirror and also freaks out. 
Turns out I got a nosebleed from being outside in the cold weather.
<bot>: Made out with girlfriend, got a nosebleed, bled all over girlfriend for 20 minutes without either of us noticing, drank blood