I'm so sorry about the loss of your dad--that's very difficult under any circumstances.
It sounds to me, too, like you have your own drinking problem you need to address. Have you been drinking through your grief over your dad and your breakup?
It's difficult to deal with those things as long as you are drinking, yourself. You might want to check out AA for yourself. You can't change your boyfriend's drinking, you can only take care of yourself.
Hugs, hope you will continue to reach out for help.