What are common reasons you stop talking to people?

Sometimes I'll be talking to people on here and they'll just drift off for a while(No harm, no foul. I've done it myself without even knowing). But it did get me thinking, what are some reasons you'll fade away from talking to someone? For me it's mostly either because they're 1. REALLY boring(asks no questions, most replies are very short and have little to no thought, never seems to have anything going on or any passion) 2. Really weird me out. Saying or doing something that just puts me the wrong way. 3. They look and act like a spam account. But those are my reasons. What are yours? And please don't go naming names, this is not about that.

For me it's just because I know I'm not great at socializing... I'm terrible at saying the right thing. I will respond as soon as I can to anyone who messages me. But sometimes I just don't know what to say to them.

Sometimes I read a message, make a memo in my head to reply later and forget it. I'm horrible at replyinng to pms.

I lose interest in people if they make it so I have to be the one putting effort in the conversation yet they added me. If I added them, I'll put effort but normally it dies so I end up removing them shortly. Ignoring/no replies. That instantly kills my interest in a person so I remove them shortly. Making bullshit excuses like "Sorry, I'm busy" but they are updating their statuses, etc. The common one I get on Skype was, "Sorry, I didn't get your message" but I can tell they have since I can tell it's been read. When someone bitches to me about not messaging them yet they keep leaving mid-conversation when their friend/bf/gf comes online. Yep.

Clingy people. Friendlys fine but I can't stand someone expecting me to focus all my attention on them 24/7 when we're vague acquaintances. Bitingly obvious jealousy sours things too.

If the conversations are one sided or boring. If someone becomes suddenly flirty without talking to me properly before. I enjoy flirting with cute guys but if I don't know you or the feeling isn't mutual it can make things uncomfortable. People who say weird or inappropriate things. Arrogant and rude people who think they are better than others.

Unless they say something that I know is bluntly disrespectful and not a joke I keep talking if I consider them a true friend even if sometimes they don't have time to talk or not much going on but as long as we are nice and equal and no belittling I'm fine with keeping contact.