His kids come first! You have to get used to it! And this will most likely never change!
Why? Because his kids are his for life!
A partner or lover could come and go but kids stay!!!
So, if you see him giving his children more time or attention than he gives to you, relax and let him see that you are 100% cool with that.
Don't fight it! It's a lost cause!
He is biologically programmed to take care of his kids first.
Don't ever be jealous or upset about that one ok?