If I as a jungler don't gank your lane frequently, it's not necessarily because I don't like you.
Sometimes, after finishing a camp, there will be two pushed lanes -- top and bottom. I will probably gank the lane I'm closer to because if I go to the other lane the situation may have changed by the time I get there.
Other times, despite being closer to your lane, I'll see that you've pushed your opponent under his or her tower -- and I don't always like to dive an enemy who has full health while they are sitting under their tower.
Sometimes, even if the opponent has pushed to your tower, when I look at the map the enemy doesn't seem to be around. At that point I may commit to another task. I'm sorry if they were merely hiding in a bush when I looked.
Even if the enemy has pushed and is present... sometimes I have no health or mana and would only feed if I came to gank. I'd like to be able to gank and help you win your lane... but I can't always be of much assistance. And sometimes when the enemy has pushed and is present... you're not there. These things happen. We all have to return to base sometimes. It's nobody's fault that we can't all be everywhere at once.
Sometimes, when I come to gank, you might not help me for some reason. Other times I might miss my skill shots or combos. These things can happen. Nobody's perfect. Just try to persevere so that we can pull it together during the late game.
If you're getting pushed around in the top lane... sometimes I might not be able to gank because I'm killing the dragon withe middle and bot laners. I'm sorry, I'll try to gank at some point in the future if I can, but objectives sometimes need to take priority
Some opponents also ward very well and can play in a very slippery or cautious manner when the jungler is around. I'm sorry if I come to your lane and can't make something happen.
Over the course of the laning phase... all of these events may occur in a single game. Quite serendipitously, during any random game, I may not come to your lane very much at all. It may seem like I'm intentionally ignoring you while camping other lanes, but often it's just a matter of opportunity or the lack thereof.
I'm sure things like this have probably been said before... but I'm posting this here now so that I can give my team a link to this post during the champion select phase whenever I am a jungler. Maybe others will want to do the same. Maybe not. Either way... this is the way it is. I'm sorry. Play safe and try to hold your lane as best you can.
GLHF!