Zach had always been a backstabber. Based on her understanding of him, Madelyn knew he was furious. She knew she would be shredded into pieces if she ever ended up in his clutches.
Zach never wanted her to get close to Ethan. This was because he was cautious of the Arnold family's power. However, his goal was to obtain the Jent family, and Madelyn was okay with that. She just wanted a peaceful life and did not want to be roped into his. This time, all of this would have nothing to do with her.