Marriage is a contract. When things so intrinsic to your core are being denied, you absolutely have a right to reconsider that.

Marriage is not some form of slavery. It's painful to have dissolved... But very doable if the situation is bad enough.

Now the problem with op, is that it appears he is depressed and burnt-out, and is transferring the depression to a biological drive for children. To do this would be unhealthy for everyone, including any children they bring in the world.