My father[70M] disowned me[41M] last weekend

This isn't like a lot of disowning stories. I'm not young, I'm not gay, and my father isn't a bigot.
In summer 2017, my 68 year old father married a new wife (aprox his age).
This Easter weekend was his 70th birthday. I live over 500 miles away, so I booked plane tickets for myself, my girlfriend of 3 years, and her 2 kids (whom I get along with amazingly well and love to death), and we all went over to his place to celebrate his birthday.
Every single time I've had dinner with him and his wife, she has invariably talked about money. I always thought it was creepy and never believed the things she said, but I think now I get it. As we finished dinner and partook in some desert, my dad's new wife announced to me that they'd decided that they were going to skip the kids, and give all of their inheritance to their grandkids. Just like that.
My father has 2 sons, myself and my brother, and his wife has one daughter. My brother has 2 kids, her daughter has one, and I have none.
You might see where this is going. I was being cut out. I was told that I was "entitled to nothing" and that "it is what it is". The person doing the telling was not my dad though, but rather his wife. My dad just sat in silence. The words "silence is deafening" come to mind.
I'm hurt beyond measure that my father would disown me. It feels like my last parent (my mother died in 2017) has broken up with me, and that I am alone. All I've ever wanted was his respect and pride, but none of my accomplishments have ever impressed him (I spearhead multi-million dollar projects that bring entertainment to thousands). I also really don't need the money, but I'm disgusted that everyone gets a piece except me. I'm destroyed that for some reason, I don't measure up. It really isn't the money, it's what the money represents.
I know very well that I am not allowed to dictate what my father should do with his will/money. But I do plan to ask... if her daughter had not had kids (by choice or by forces outside of her control) if his wife would disown her own daughter?
I know the answer already, as do you. Which is just another reason why it hurts so much.
I don't know what to think, I don't know what to do, and I'm just looking for feedback. I want to tell them off and cut them out - but I love my father and wouldn't want to end my relationship with him. But at the same time, what he's done (or allowed to be done) just seems so wrong... I would never in a million years do something like this to my son. I really don't know what to think. Help me Dating.mobi.
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TL;DR: I was disowned by my father last weekend. His wife has managed to cut me out so she can cut herself and her daughter a larger slice of my dad's pie. I'm devastated, heartbroken and angry, but I don't know what to do next.


Source.