Can you not marry ANY Non-Committal Sim? My current Sim Roxana is dating a Non-Committal Sim but I figured if he did the proposing then she'd say yes. Instead she slapped the ring out of his hand (...
My sim married Don Lothario who has the non-commital trait with ease. He often gets a negative moodlet for feeling "trapped" but other than that, their marriage is pretty solid.