just a rant

I am so irritated, pissed, annoyed, angry, you name it! 
I got home around 5:15 pm today. I leave work and then go to my son's school and pick him up.  I got home and my 9 year old daughter was sitting here alone.  I asked her where my husband and step daughter were. She said they went to pick something up.  Well, I knew that my husband had a union meeting tonight. He took his daughter for the free meal and meeting and left my daughter here.  I asked him how long my daughter had been home alone.  He told me he left around 4:20 pm.  So, she basically sat home alone for an hour.  She was fine.  I just can't believe it!  Then he asked me if he was in trouble.  I told him "no".  I said that I thought it was pretty shitty to take his daughter to dinner and leave mine home alone. I then said that my daughter isn't his responsibility.  That I was fine.  He came home and started in on reaming my ass.  He said it wasn't about going to dinner it was a union meeting.  I then said well, what does his daughter need to go for then if it wasn't for her to get dinner?  He said that wasn't the point. The point is that my daughter wouldn't have behaved herself there. She would be constantly needing his attention.  I wanted to tell him that he is thinking of her when she was 4 years old and not how she is now.  I just said fine.  He kept yelling and telling me that telling him that my children were not his responsibility was hurtful to him.  Well, that is how he acts.  He does anything for his daughter and when I point out that he treats her differently than my children he gets mad.  He then reels it in for a while and tries to treat his daughter like the others.  I know it isn't easy to take on someone else's kids.  But, I always include his daughter when I do things.  He acts like taking my children anywhere is a burden.  Well, my kids both have ADHD. They can be annoying at times.  But they are human beings with feelings.  
At any rate, when I got home and saw how things were here, I took my kids out  to dinner.  I would have taken them for ice cream too, but we were full from dinner.   
I just love how I point out the obvious to my husband and then he lashes out in anger at me for showing him how unfair he is.  I don't always do it in a sarcastic bitchy fashion.  Tonight tho, I just couldn't help it.  
My son has his MRI tonight and I plan to take my daughter with us.  He said something about how he isn't going to watch her and his daughter isn't going to either.  I would hate to leave my daughter here with them.   
Ugh!  I don't know if I can get thru this.  I am so angry that he treats me like I am the one who is wrong. Maybe I am.