1. Although we broke up a long time ago, I am still in love with her.2. I still have feelings for him after all these years.3. I am still hung up on Sara after we split up.
 in love with somebody have (strong) feelings for somebody be hung up on somebodyin love with somebody = have feelings for somebody = 深愛著某人I am still hung up on Sara = 我還是深愛著 Sara，此成語是正統的英文，土生土長的美國人較常用