Older child acting out

Samantha

I have a 5 yr old that is crazy hyper all the time and since our move from one country to another (6mo ago) and our new daughter he's been just plain mean. To us and her. He loves his sister but he's sooo jealous of her, like crazy jealous, and he gets violent with her sometimes. I have no idea what to do. We've loved on him a lot and spent a ton of time. Any advice? I'll take anything.