Subject + 爱上 + Object + 了
The verb 爱上 (àishàng) means "to fall in love with" and indicates the beginning of romantic feelings. The directional complement 上 after 爱 conveys the sense of love taking hold or developing. It is followed directly by the person one falls in love with.
他第一次见到她就爱上了她。
Tā dì yī cì jiàndào tā jiù àishàng le tā.
He fell in love with her the first time he saw her.
我去了那个城市以后,马上爱上了那里的生活。
Wǒ qù le nà gè chéngshì yǐhòu, mǎshàng àishàng le nàlǐ de shēnghuó.
After I went to that city, I immediately fell in love with the life there.
她慢慢地爱上了这个安静的小镇。
Tā mànmàn de àishàng le zhè gè ānjìng de xiǎo zhèn.
She gradually fell in love with this quiet little town.