Am I overreacting to my boyfriend not inviting me to seaside?

My bf and I have been in a LDR for 2 years. For context, we only see each other 2-3x a year due to how expensive flight tickets are. He and 2 of his friends are flying to my area for an event. My bf will be staying with me, while his friends are staying at a relative’s house. I booked us tickets to go see the water lantern festival. He ended up invited his friends, which I didn’t mind. However, he told me after the festival, he and his friends are going to Seaside and I’m not invited. The only female exception is his friends’ cousin because she’s driving them. He claimed that it was boys only and I would ruin it. In addition, he stated he’ll be with me for 1 whole week, so he wants his alone time with his friends. I feel really left out. I’m also upset because he genuinely hangs out with his friends everyday. He thinks i’m overreacting because he stated, “I’ll only be with them for 2 hours”. Do you guys think I’m overreacting?