I overheard what my dad said to my boyfriend when I was in the ER/Lab after giving birth to our stillbirth, and it haunts me

Our baby passed away at 21 weeks 5 days/Late September. My bf and I were so excited for our first child. My bf is my first boyfriend I have ever had. I waited for him. My father is a hard worker. He works all the time, even though he is really wealthy, so he does not really have time to be there for me/in my life. So he had to take off days to take me to the hospital. So he was frustrated that he had to do this. I could then hear him say something to my boyfriend, I won't say what, but it was really hurtful. I have still not gotten over this. I was emotionally numb the whole time and started crying when he left the room. Then my boyfriend came in, and I started crying more because I knew he was hurting so badly. I was so deeply hurt, I would not wish this on my worst enemy. Then I found out I was going to have to push out my stillbirth. It was the worst time of my life. I am still grieving really badly. I am going to therapy and I have support, but I still feel really empty.