You could look into couples counseling and see if you can learn how to argue productively. Arguments itself aren't a bad thing to happen, but there's constructive ones and there's pointless screaming and raging for the sake of screaming and raging. You can then bring that recording in and see if analyzing it helps you with conflict resolution. It also gives you the opportunity to explain why this is causing you to lose trust. Even in case of a divorce, there's still that child you'll have to parent for 18 years, so it would be useful to find some discussion skills there.

Your both first instinct in this was about divorce, so think hard about the relationship itself. He was already resenting the costs of a child and felt this would protect him. You offered an alternative, but in the end, nothing happened. So the feelings are still there, just get no attention. Ignoring is not going to stop this all from seeping in relationship cracks and tear the bond further.

Consider what you're exactly hoping for. Perhaps it's better to be parents only, instead of romantic and financial partners.