Working all the time

So when we had our first son I asked my boyfriend to take less hours at work for a few months so that he wouldn't miss that newborn baby bit. He said work needed him more. He did none of his share of the baby stuff. He spent so little time with our son that at three years old he only wanted me and I couldn't even leave him with his dad while I went shopping as he would just cry. Three years later and birth control failed, my boyfriend said it will be different this time around. He went back to work a week after our second son was born. hasn't changed an outfit, diaper, nothing and our son is six months. My fault for believing him I suppose but he's already leaving for work 8am and coming in at 11, midnight and he's just told me he's applied for a big promotion which means more time at work. Obviously I don't want him to miss out on the promotion but he didn't even mention it before he applied. He's also started spending most of his earnings on getting drunk but won't admit he has a problem. If I mention it 'he can do what he wants as he's earned it' and he always needs a drink to relax after work. I've tried talking with him, financially we will be okay if he cuts a few hours to spend with the boys but he just doesn't want to. When he does have a day off he spends it by himself as he wants time to wind down! What do I do if he just doesn't seem to care?