You learn about the trip from the photographs. Everyone looks happy. You are happy for them, and hurt, and embarrassed that the hurt is quite so sharp. Jesus' words about friendship deserve more than a cheerful slogan on a day like this.
Read John 15:9–17. Jesus speaks to His disciples about remaining in His love, keeping His commands, and loving one another. He calls them friends and speaks of what He has made known to them from the Father.
The friendship He describes has substance: love, trust, truth, and a life offered for others. It doesn't erase the pain of human exclusion or promise that every relationship will become close. It gives us something solid to consider while we decide how to respond.
Begin with an honest conversation
Tell Jesus what hurt. You don't need to make it sound mature before bringing it to Him. Then consider whether a calm conversation with your friend would help. Ask what happened rather than treating a photograph as the full account.
You may also need to make room for new relationships or change what you expect from this one. Choose a response that can hold both truth and love. Neither requires pretending you were never hurt.
You can take this slowly.