Jeremy left the house after he said his words. He let her think this over despite he was supposed to have her word that she would come to the concert tonight.
He wanted her to accept him with her whole heart and believed his words have penetrated through the wall around her heart. So he gave her time to think it over.
He went back to his home to get ready for the surprise tonight. He also needed to think about what to do if Ryn suddenly did not want to come. Better expect the unexpected even though the thought of 'kidnapping' her to the concert did come to his mind last night right before the concert. However, he quickly dismissed the idea.
It would only make things worst.
It would make the love that Ryn still has for him to turn into pure hatred.