Nate's confrontation with and proposal to Matt doesn't turn out quite the way he and Ava wanted, which leads to a growing rift between husband and wife about how to proceed from here with the assumption that Matt doesn't know of Ava's involvement in or knowledge of the proposal. Their friends can also see a change in Nate, who may not be able to hold it all together as he fears for himself and Ava as they wait for the deadline Nate had set for Matt to respond and as others come to Nate's attention as knowing his connection to both Chloe and Matt.
—Huggo