I'M SOOO EMBARRASSED!!!!?

My boyfriend and I were in his room kissing and he put his hand under my shirt and was playing with my nipples so I took my top off. Then he slipped my shorts down and put his hands in my panties and started rubbing me and I was so into it I started moaning and my legs were shaking i didn't even notice when he took his hand out. All of a sudden his door opened and I opened my eyes to see Jason staring disgustedly at his bloody fingers. His brother was just staring at us both with this mixed expression of shock and amusement. I looked down and there was blood on my legs, all over my thong and his sheets. Then his brother started cracking up and said something like "Damn maybe you should have checked before you put your hands down her pants." And Jason kind of pushed me to the side and hopped over me to run to the bathroom muttering "Damn damn damn SH**!!!" I just sat there embarrassed covering myself and his brother threw me a towel and asked what I was gonna do about the sheets before their mom got home. i just wrapped the towel around my waist and ran passed him outside. I DONT KNOW WHAT TO DO!!! HE HASEN'T CALLED OR ANYTHING!!!!! It's not my fault. I can't even face him.