He's madly in love. It's not that they don't care. They're nervous because of the extended gaze. They feel confused when their eyes lock, and they tend to forget all they planned to say. He's telling you that he understands where he stands with you now and that he's not frightened by making continuous eye contact. He's saying that he wants you to know that he's here for you always. In conclusion, an ex's eyes can tell you a lot about how they feel about you. When an ex locks eyes with you, it shows that they're thinking about you. It also tells you that they're nervous around you which could be because they like you or because they don't want you to know what they really think of you.