<human>: Can you provide a brief overview of the text?

My friend, Dylan, and I have been friends since middle school. We  were always around one another and maintained a close bond through high school. We attend different universities, but texted and have been hanging out throughout this summer. A week ago, my best friend from college, Sarah, decided to drive in and visit for a weekend. She was going to stay at my house and Dylan was going to meet her for the first time and we were all just going to drink and smoke and crash at my place.

Sarah and I spent the day together and I showed her the sights of my town, and then we picked up Dylan to head back to my house to hang out. We drank and smoked, and it was a pretty nice time, although Dylan was a little distant and barely interacted with Sarah.

We all went to sleep on couches in the living room around 1am, and we woke up. Sarah and I drove and dropped Dylan off at his place. Not a minute after, she told me that while I was asleep he tried to make advances on her. She woke up to him putting his hand on her leg. Then he got on the couch with her and tried to kiss her; she didn't reciprocate and didn't say anything.

He groped her, pulled his pants down, said something to the effect of, "aren't you going to do anything for me?", at which point she told him off and pushed him off of the couch.

Obviously I was shocked to hear this, and she was obviously disturbed by what happened. She told me she felt really unclean, and I feel awful.

I haven't had any contact with Dylan over the days since, mostly because I'm uncomfortable being around him. There's a chance he doesn't remember what happened, as he was very drunk, but obviously regardless that doesn't excuse anything.

How do I come to terms with this/confront him? I worry he thinks it was normal sexual behavior (he is very inexperienced) and that it was consensual.
<bot>: My best friend since middle school sexually assaulted one of my best friends from college. How do I confront him about this?