Ex showed up at my work?

Me and my ex got into a fight the other night. He said it was my fault he relapsed in his drinking and drug addictions which made me so hurt I hung up the phone. I haven't heard from him in days and he just showed up at my work with his friends for drinks and is acting like I don't exist. He texted me saying he's sorry and didn't know he was coming here.

I don't know how to act? His friends are waving at me more than he is. Should I just ignore him or ask him to talk before he leaves?
Ex showed up at my work?
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