Does sadness from a past relationship ever randomly effect you?

Basically me and my ex boyfriend broke up two years ago now (almost) he has a new girlfriend now and I have a new guy. The break up ended sadly and we have had no contact since. However lately I have seen him twice on the street within the past week! (He's not seen me) and ever since I have not been able to stop thinking about him and the times we had. I even actually have been crying over it when I'm alone. Wtf? I thought I was over this. I haven't felt like this since we broke up which was like I said almost two years ago now.
What does this mean?
Does anyone else get like this over exs? (Random sadness)
Feel really shitty not to mention guilty and annoyed with myself.
Does sadness from a past relationship ever randomly effect you?
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