Nintendo did more than just dump Sony, they humiliated them.

Originally, Sony was supposed to be Nintendo's partner for the CD-i machine. Nintendo went behind Sony's back and partnered with Phillips.

At the summer 1991 CES when Sony was expecting the CD-i machine and their partnership with Nintendo to be announced, Nintendo announced the product with Phillips as their partner.

I can't help but wonder how much animosity towards Nintendo contributed towards the development of the Playstation 1.