The core of this whole problem isn't the work of how hard it is to take care of two kids or the division of labor.
The problem is you're not communicating like two adult partners running a household together.
And I'm not saying that's your fault, or his fault. I don't know the dynamics of your relationship and the way you communicate. I'm just stating that there is a huge lack of communication.
Preferably, this communication should have happened before you had kids together, because a lot of these issues were perfectly preventable. But that doesn't mean you can't communicate now. However, being angry, bitter or resentful to your partner usually breaks down any constructive conversation, so try to have this talk with an open mind if you can, or involve a therapist if you can't.
Before having kids, I sat down with my husband (then boyfriend) and we went over absolutely everything we could think of.
How did we feel about the balance between work and family life?
What did we see in terms of our parents and rolemodels? Is this the life we also want? And if not, how de we change our behaviors from the things we have learned to avoind falling in the same trap?
How much room should we each have for free time, away from our responsibilities?
How do we use weekends, holidays and vacation time? What do we each see as priorities?
How do we stay out of the typical overworked mom/unbothered dad dynamic and what do we both actively need to do to avoid this.
Since having kids almost 5 years ago we've sat down more than once to re-evaluate and make changes. Husband wants to take on extra freelance work? We sit down and discuss how that would impact the balance in our family? I want to go back to school and get another degree? Same! How does homework and exams and me being less available overall impact the workload for my husband and is he up for that right now? But we talk about this without blame or anger and assume the other is just trying to do what's right most of the time, even if the outcome isn't what we would have liked.