The timing could be a coincidence, but... I wonder if she couldn't handle her husband being intimate with you, asked/told him to break it off with you, and broke up with her boyfriend as well to make things "fair". It sounds insane, but some people just handle things incredibly poorly.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.