My best friends girlfriend always hits on me. My friend has cheated on her several times. I don't know why he would; shes a really cool attractive girl. Anyways one night after runnning out of beer my friend went to the store for more. She started flirting with me hard. Normally I wouldn't escalate this situation. But i was drunk and horny. So i flirted back. I sat by her and we shared a kiss and i fingered her. I woke up the next morning and felt like a complete dick for what i had done. Now she flirts with me way more and wants to fuck. I don't know what to do.