What's interesting is that you haven't raised these concerns with your partner sooner. How is the communication between you both?
It sounds to me you may need to do some uprooting work in your relationship, to bring to light some 'possible' issues that are manifesting surrounding communication.
Are you comfortable asserting your needs, want and boundaries to him. And equally how well does he 'receive' when you've raise issues in the past.
It also sounds to me (and I could be wrong) that your a little jealous of the daughter. In a way, your comments read a little like you're a victim, I haven't read anything from you asserting yourself as an adult to take control of the situation by addressing it with your partner.
To simply want to bail on a relationship after 3 years because of the way you've not addressed a communication issue - makes me think this behaviour will follow you to your next relationship.
Relationships take work from both sides. Are you both commited to honoring each other's needs within this partnership. It sounds like he has rightly set a standard for himself in regards to how he is spoken to, but you not so much - and tbh that's your job to communicate.
Relationships are not like Disney movies, they take real guts and determination to face the things that 'we' need to work on for growth. The title, I fear, should read 'I have communication issues, help!' Tbh