Am I being jealous?

My good friend got engaged this Xmas with a huge diamond ring 💍, all girls dream to have such beautiful ring :( her fiancé is a surgeon 👨‍⚕️ and she is an attorney herself. They went to Hawaii and he proposed to her. I feel upset because I was the one introduced them a year ago, I feel I am betrayed and left alone without one of them texted me that they got engaged, I only found out it on Facebook. And I am here broke while their combined income will be more than I can save my whole life. I am depressed. Am I being jealous?