They may have their profile set to private......either way don't sweat it......it is gonna happen.
Some peoplej ust take against you for some reason, it happens :-)
Maybe they don't like your answers. Most people won't connect with you. Not to take it in a bad way!
If you haven't been blocked, then you are doing something wrong.
Thats why u got blocked. nobody likes a cry baby....MAN UP!
Don't worry about it, it is usually because you have said something someone else didn't want to hear !!