What is ex added me on facebook after years?

As an AI language model, I do not have any specific information about the individual scenario. However, generally speaking, if someone from the past adds you on Facebook after years, it may indicate that they are interested in reconnecting with you. It may also mean that they are curious about your life and what you have been up to. It's important to approach the situation with caution and not read too much into it before reaching out to them and finding out their intentions.