Okay just a quick rant, folks -- let's do this one as a hypothetical situation.
Let's say you're new to town and you meet someone who seems pretty cool, fun and social. So you exchange contact info, you hang out with this person and their friends a couple of times, and all is well.
Then on a Friday morning, you email this person and ask what they're up to after work. Said person responds and says they are meeting up with some former colleagues at a bar in the city, and will be in touch later to possibly meet up. Which of the following adventures would you choose?
A) Say that getting in touch later sounds good, and make other plans
B) Respond to indicate that maybe you will just get together another time, and make other plans.
C) Ask if you can join the group.
D) Reply to say that you will be at the bar at 5.30pm, waiting.
So yeah, I might have a stalker, and I am vaguely annoyed about it. He's not even a bad person, I don't dislike him, and maybe it's my own fault for telling him what bar I was going to after work. However, I didn't realize that you had to be more obvious than pointing out that it was a get together for people who used to work together (i.e. this has nothing to do with you). Not to mention that when someone says "Oh yeah, stay in touch tonight and maybe I'll see you later" is pretty much universal for "I have better things to do, I will call you if I'm bored at any point in the next few years."