My girlfriend (primary) was in flight attendant training for 6 weeks and had an intense relationship with a guy who was also in training. It felt to me like it was too intense and probably beyond our (admittedly somewhat poorly defined) boundaries. As poorly as they are defined, one thing I've always made clear is that if she is seeing someone who seems like they want to replace me, that's a hard boundary and I want the relationship to end at that point.

She told me recently that this guy at training proposed to her. It's possible that it was a drunk thing, but I feel like this shows a lack of respect for our relationship. They had already cooled it on the physical part of the relationship when she told me about this, but I'm seriously considering asking for no contact. Anyone have any advice or thoughts they can share?