You've brought this up to him, and yet, he was dismissing of your need for something more out of your companionship, with him. Just because he loves you and would never leave, doesn't mean that the marriage is healthy and where it needs to be.

((if I were to actually say this to him, directly!))

You, Refused, marriage counseling?! Buddy, you've got a wife, that's not happy and all you can say, is that because you love her, everything is fine?! But you aren't behaving lovingly towards her. Providing a roof over her head and a 'nice life', just isn't enough to sustain a marriage!! She needs companionship. To feel heard, to have more than material possessions. Plus, she wants more kids!! Wake up!!

If you do pursue, separation, granted, ok, you won't get much financially, but beware of whatever you do, that he doesn't fight for full custody. Fight for at least, full physical, if you do!! If he's not the type to participate, in daycare and school, etc, go for full legal! Make sure, you get child support!