心里有他装不下你心里有你容不下她
[xīn lĭ yŏu tā zhuāng bù xià nĭ xīn lĭ yŏu nĭ róng bù xià tā]
A somewhat complex emotional state is described here. It implies a triangular relationship - there's already someone ('he') occupying my heart so that there's no space for another person ('you'), while when my heart accepts someone ('you'), there is no room left for yet another ('she'). This reflects conflicting love situations or choices people may encounter in life.