Work- Seen him

So I’ve ran into my rapist months ago and it was hard and stuff but for the most part I grew stronger from the experience and finally coping. Well last week he came into my work, and looked around (work at shoe store) and then when walking out he winked at me. I haven’t told any of my managers about it, but I broke down and it was hard to focus. I don’t like the idea of him knowing where I work now, especially since I close most days. How should I approach my boss about this?