dmrafa, I wanted to write you more now that I have a moment. It must be horrible seeing that coming--your GF going on vacation to cheat again with OM. If there were a magic way to avoid that, we'd gladly share it with you. With the ultimatum approach, more likely she goes and you look controlling and weak, less likely she doesn't go but only because you frightened, shamed, or embarrassed her. I don't see either approach helping lead you to re-building a relationship with your GF. Whatever her ethics were before, for now she's choosing to lie, and she's unfortunately choosing OM over her relationship with you.
DB'ing doesn't mean there's no hope of reconciliation. You find happiness without her (you're not a safety blanket), you reduce cake eating (e.g., sharing your home, meals, finances, daily lives, and photos), you become the best dmrafa you can (GAL and self-improvement). As you move forward (actions and intent, not words and acting) she may look back. R chances often come, if you even want them, and are in a good place when they do. ((Hugs)) This is terrible stuff, but you're going to come through stronger.
Whatever human imperfection drafa has, you've been faithful, and are focusing on S6. You being comfortable going on a weeklong trip with S6 while she stayed home and saw OM says something good about you.
