Don't you hate when you're really enjoying talking to someone and they just abruptly stop replying?

Some people can only handle small doses. Best way to guage it is to occasionally give them an easy way out of the conversation. If they take it, conversation over. Talk later.

You just wanna shake the shit outta them

No I love that feeling

Sometimes you can just hit a topic that completely rubs the wrong way and the person you're talking to doesn't know how to react. I had to stop replying to a few people because of situations like that on a different site