I Heard My Husband Talking To My Mom-In-Law In French About A Plan, Then I Fled Immediately

I had just gotten home when I could hear my husband, Arlo, and his mother speaking in his native language, French. Their hushed tones raised a suspicion I couldn’t ignore as I tried to understand what they were saying. They believed that I had never made an effort to learn, but only recently had I decided to learn it for him as a surprise for our upcoming anniversary. 
It was then that I heard something alarming and definitely not meant for my ears, and I immediately knew that I had to get away.