a second chance at us

Luke & Olivia (Libby) married young. They were married for three years. They have a son together (Andrew/Andy) who is two. Eventually, they got divorced and are constantly fighting. Unfortunately they have to see each other every week, when they drop their son off at the other's house.

Now, they are trying to set aside their differences for the sake of their son. And are getting along better. Are they re-kindling their past relationship, or are all these feelings regret from what happened before?