What does it mean to dream that your married to one of your girlfriend's best friends?

In the dream I get married to this girl that me an my girlfriend stood in her wedding like a few weeks ago, she's one of my girlfriends best friends if not her best, I love my girlfriend with all my heart what might this dream mean? Oh yeah an in the dream at the end I was in an empty room thinking about my girlfriend feeling sorry that I married this other girl instead of her weirdness right? Lol idk so tell me what you think :) thanks