I dont like people who read messages, and leave me on read for hours/days sometimes and only then answer.. or not at all. I will never be able to respect that in closer relationships . i mean ok everyone has their right not to respond or busy but wtf is it so hard just to react somehow it takes not even a second. 
I will never be friends with those Kind of people i tried and it makes me sick and i feel that is like a powergame or something and i am not worth replying.