<human>: Can you summarize the given text in a few sentences?

My ex girlfriend's dad was in terrible health.  He was young(ish) about 41, and had major heart problems.  I was working with him the day he died.  He was unbelievably pissed because his daughter(my ex), his wife and his step daughters were all out shopping late(supposed to be back by 3 to let him off early, it was 6pm) on December 21st(day before my birthday, also day he died).  He called and called, but they were ignoring his calls(Ex was texting me intermittently so I know they were ignoring his calls).  He had woken up that morning feeling very sick and dizzy.  Being the hard working, loving, supporting father he was, he went to work anyways(family owned restaurant).

630 rolls around, he gives me the last paycheck he ever gave me, let me off early and said 'Have a happy birthday tomorrow, [redditor], don't hurt yourself'.  He was still very frustrated that he was feeling so shitty and couldn't go home.

This happened often, he would wake up sick and dizzy, still go to work, while mom and older sisters slacked off at home, or came by to get money from the register.  The family used him, for lack of better terms. (example, he gave up his medical needs to pay for wife's H2 hummer, dad regularly worked 14-17 hour days)

Anyways. I get off at 630, girls are still out shopping, the dad was still very frustrated and tired.

I get off, get a call 30 minutes later, the dad died at work, from a heart attack, while the girls were out spending the money.  I never told my ex how pissed her dad was at them before he died.
<bot>: My Ex's father was pissed at her, her sisters and mother for hours before dying of a heart attack.  I have never, and will never tell her.