This is why Top lane is considered an island. Think about it like this:
If he ganks top lane and gets your or himself a kill what else does he gain? MAYBE a turret? Obviously not baron.
What does he lose by ganking top? If he shows himself top lane, that relieves pressure off of the enemies bot lane, it means the enemy jungler can gank bot or mid without fear of a counter gank. If the enemy jungler has a successful gank in bot or mid, what can he gain? Dragon.
On the other hand, if your jungler is ganking bot lane or mid lane, that can mean a free dragon for your team, it can mean getting kills for your carries.
Dont think of it as, he doesnt care about you, or doesnt think you need help, think of it as, there are more important objectives near the bot lane than their are near the top lane.