So, my boyfriend and I have a mutual friend, my boyfriend tried to explain to me that his drinking is OK because he's always with this mutual friend when he does it. I've known this mutual friend to have extreme drinking problems in the past, and again recently he expressed to me that he knows he drinks too much but he can't convince himself to stop. The mutual friends grandmother died and the funeral was today so my boyfriend went to the funeral and has been with him all day. My boyfriend has been reassuring me all week that he wouldn't let the friend drink especially at this hard time since he expressed having a problem. Earlier today my boyfriend said they were having one beer with the friends dad and I let it slide, but now he just texted me and said they're going out to the bar.
Also, my boyfriend drives EVERY TIME he drinks, he promised me he'd only drive when he'd had one beer since we've been back together and this really pisses me off for that reason too.
I'm seriously ridiculously angry right now, please tell me what to do in this situation.