ET's Melicia Johnson breaks down the must-see moments from part five of ‘90 Day: The Single Life’s season 4 tell-all,’ from Mike serving Natalie with divorce papers on camera, to Ms. Debbie and Mama Debbie getting into an intense back and forth. ‘90 Day: The Single Life’ airs Mondays at 8 p.m. ET/PT on TLC, and streams on Max and Discovery+.