<human>: Can you give me a shortened version of the text?

I met a boy the other night and he has a girlfriend. He asked me to kiss his friend, to which l said no, and kept joking With me about it. We were getting along well but not flirting, in fact we were talking about how great his gf is. (They have only been going out for a week but have been flirting for months and they are great together) 
I got a lift home from the party with his sister and I sat in the back with him and his friend whom he wanted me to kiss. We all were having such good fun and back and forth banter when he set his hand on my leg, but I thought nothing of it. Then he pulled a hoodie off the floor and threw it over me. To my shock, he slid his hand between my legs and started feeling my thighs but said nothing of it and pretended it wasn't even happening. Since his sister was in the car I pretended to be oblivious to it also as I didn't want to embarrass him or cause a scene. He started sliding his hand up higher so I put my hand in to stop him and show him the limits, especially since he has a girlfriend!! Immediately he held my hand in his and began stroking it and to my surprise I left it there. So we were in the car holding hands in secret beneath a hoodie which no one was aware of except us. It really was a guilty pleasure I didn't wanna let go but I knew I had to. Soon we were at my house and as I got out, not a word was said about it. He added me on snapchat the next day and followed me on Instagram and we started talking. He lives very nearby and I have countless mutual friends with his girlfriend. I don't know what to do, I feel guilty but in that moment i didn't feel like I could do anything. 

WHAT SHOULD I DO?
<bot>: basically boy i just met who has a gf held my hand and touched my legs in secret the whole way home. I don't know what I should do.