Thats the saddest part of it all- Leewon already had feelings for Caesar before all that but under an abusive and life-threatening situation he developed strong feelings of love and attachment towards the one who ruined him
The vase with roses is the metaphor for Caesar. He wants to break it to be free from him after the abuse he endured but then he stops because of all memories he had of him, the bad ones and the good ones- of the only person who showed him care and affection