I was sexually assaulted by a dude, should I fight him?

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On the weekend I got too fucked up at a club and a guy I know offered to let me crash at his place because I was too far gone to walk home. I know him pretty well so I thought he was just being a mate and I accepted. As soon as I lay down I started losing conciousness, and he took my pants off and started touching me up. I'm not sure if he thought I was awake or not. It went on for a while until I found the strength to roll off the bed, and rebuckle my belt. I slept on the floor. I didn't remember this until I'd already left the next morning, but my belt was still done up so I don't think he tried anything else. The thing is, he knew I'm straight. I dated one of his chick friends for a while a few months ago and that night he straight up saw me making out with a girl.
Should I fight him?
I can't be fucked going to the cops because they won't take it seriously and I have no proof (and I'm not a snitch) but I also don't want to just let it slide.
I'm thinking about bluffing him and threatening to go to the cops if he doesn't fight me. I'm bigger and stronger than this guy and I don't think he'll press assault charges because of the whole molesting me thing, but I'm still not sure if it's a good idea

What should I do?