Boyfriend going overseas with a female friend

**Summary:** I'm a 19-year-old female and my boyfriend, who is 20, and I have been together for nearly three years. We see each other every weekend, as we live in the same hometown, but attend colleges that are a bit apart. My boyfriend has the chance to travel abroad for two weeks through a program his female friend informed him about. She is also applying, and he decided to join in. They previously went to Europe together for an exchange program over the summer, which made me feel jealous since they had made that trip before us. Now, he might go to Asia for two weeks, while I've invited him to visit my home country with my family, who is willing to cover his ticket. Unfortunately, my trip to my home country is scheduled for the same time as the potential Asia trip. If he gets into the program, he'll choose that over coming with me. I can’t shake off the feeling that it’s unfair he’s traveled with her before and could do so again. While I recognize it's an amazing opportunity for him, I'm struggling with the jealousy of him experiencing a different culture with someone else—especially since I've always wanted to travel to Asia with him. How can I manage my feelings and be more supportive instead of feeling jealous?