Okay, how is that different from thinking someone has you on ignore or not? Unless you are stalking the person, know when they are online and when they are not, you have no way of knowing when/if they get your PM and/or if they have time to reply or other things are going on in their life, etc. Personal/Private messaging is not "instant" messaging!

My motto is assume the other person cares and likes you until they tell you they don't and ask you to go away and leave them alone Why assume they don't (whether or not they tell you they do :-) when it's all one's own assumptions anyway? If you are going to jump to conclusions, make them good ones rather than bad ones? If you have a choice between a swimming pool and a mud puddle; choose the pool?