boyfriend is going to China?

so I've been dating this guy for about 5 months now and I am completely in love with him and he is in love with me. Well he's from China and moved here 3 years ago. But he will be going back to China for two months to get his teeth fixed. I am so scared and nervous. I know he would never cheat or anything because he's very loyal and he always stresses it. He keeps telling me to just have a fun summer and he will always call me and keep me updated and he is making plans for us when he comes back. I'm still so scared and nervous. He has a lot of friends and some of them are girls. And he said he would never even do anything because he doesn't look at them that way and that they aren't his type but I still get jealous very easily. Plus he said he will be hanging out with his brother and staying with his grandma. Does anyone have any advice on how to not get jealous or to keep calm? Or to get my mind of off the fact that he's gonna be gone for two months? I'm really going to be freaking out haha. Any advice? I'll appreciate it!