It sounds like Hector is jealous because he's had you to himself and sees the new kitten as competition for your attention.
It's hard to make cats play, but have you tried putting a few big cardboard boxes in the center of a room? You can open the bottom of the boxes and turn them on their sides like tunnels. Cats usually love this, and they might start playing hide and seek on their own.
The only other thing you can do besides giving him time to adjust is make sure he gets lots of attention and praise. Give them both treats at the same time, so he associates the kitten with something he likes.
It may take some time, but you should slowly see improvement.
If you think that he's bullying her when you're not around, you might want to keep them in separate rooms when you're away until you're sure they're getting along.