Boyfriend said he doesn't want to know

My boyfriend went out with his friends last week to get drunk. We go out clubbing a lot. I just didn't this time because I wasn't feeling well. So he went on his own. His friends couldn't find him so they just left. Usually he would call me if he's too drunk to drive home but he walked and it was like an hour walk. He doesn't remember walking home though. He just ended up back home. I went to his house and he was telling me that he didn't remember walking home and it's strange because he's never gotten so drunk he doesn't remember walking home. Same day I was there the police knocked on his door.

The police were there for a welfare check because someone had driven past him and tried to talk to him and ask if he was okay because he was bleeding and wasn't wearing his pants. My boyfriend thought he must have just taken his clothes off when he got home but this person who called said he was in his underwear on the street walking home and when they tried to talk to him to ask if he was okay he walked right past them. My boyfriend has no memory of this. The cop asked him if he wants to go to the hospital for a sak test and he said no. She asked was he sure and he said yes he's sure. I askedy boyfriend why and he said he doesn't want to know. If something happened he doesn't want to know. I don't want him to do something he doesn't want to do. So is the right thing to do to just let it go? 😕

Edit: They told him a sak test is the same as a rape kit. They just wanted to be sure..I get it's his choice. I didn't say anything to him and let it be his choice. Just don't want him to regret it down the line ya know? I was raped and regret never reporting it.