Disappearing act

So my bf went totally awol all weekend, from Friday night until Sunday morning. Phone wAs off, and no one could find him. He left everyone worried sick and ready to phone the cops and report him missing. Ended up, he took a cocktail of drink and drugs and was at some house party with like 15 other people. And he thinks it's just acceptable to say, I went on a bender for a few days so what, I didn't do anything with anyone or go near anyone so I've nothing to feel any guilt for. Would you trust him? I certainly can't. That's our relationship 110% over.