Ex probs

Okay so just want others opinions. Three years ago my ex cheated on me. (He was my first.) we hadn't really communicated much since then. But here recently sometimes he will Snapchat me. And last night he was saying he remembers stuff from when we were dating, and he sent me an old pic of us. But he kept telling me he couldn't tell me a certain something, maybe at another time. What could this mean?! 🤦🏻‍♀️