I attended a seminar about two months ago for a software that I use at work. Right before I leave a young guy apporaches me, makes small talk etc etc.. gives me his number and says to call him sometimes. Well... I never called or emailed him.. actually completely forgot about the whole incident.
So this morning, I drive in to work... pull in the parking garage and who pulls in behind me? OMFG... I didn't tell him where I worked. And even If I did the building I work in is in a awkard place thats in the valley of our main office.. so I get out my car.. and It this guy. HOLY FUCK! He's like I know this is crazy huh.. I was dropping my friend off down the road and I saw you pass...
So Im like wtf you followed me here

. And he's wanting my number... etc etc.
Now I'm all weired out... This type of thing just isn't normal. Am I over reacting or should I be really cautious?