Just to give a different perspective (while still agreeing with the other commenter): marriage can mean something different to each couple. Could the two of you consider an open marriage? A convenience marriage? A marriage where, practically, you sleep in different rooms? It could (maybe!) allow you to get the parents of your back, and could (maybe!) allow you to both be present for your kid. But rules need to be clear for both of you. How would it look like if one of you wanted to date outside the marriage?

Keep into account the society you live in as well.