Because of Sai's training with Root, he has spent most of his life not really in touch with his own emotions. He's been trained to push them down and ignore them. Even as he learns to get back in touch with them, he still retains some of his training and some of the personality traits that came out of this.

Does Sai get his emotions back?

When he is added to Team Kakashi as a replacement for the rogue Sasuke Uchiha, Sai begins to learn more about people's feelings and tries to develop his personality and identity by forming genuine bonds and rediscovering the emotions he was taught to suppress.

Does Sai really love Ino?

Ino is shown to be blissful about her relationship with Sai, believing she will get married much sooner than Sakura. They are shown holding hands at Naruto and Hinata's wedding. ... It is revealed in the final chapter that Sai and Ino are married and have a son named Inojin Yamanaka.