I'm assuming he has built a bubble nest already, so he is ready to breed. This could mean that they are just getting used to each other again, I'm very surprised they never began breeding immediately or at least tried to bite each other. You know I would watch them if they still have not bred then this is a strange thing lol. Just wait and see, it could be a few days before they begin although they should have begun a long time ago. But patience is key, and don't leave her in the tank over night take her out and re-release her in the morning so that you can observe.