ET's Melicia Johnson breaks down the must-see moments from part four of ‘90 Day: The Single Life’s season 4 tell-all,’ from John proposing to Meghan, to Jamal and Luisa revealing they hooked up ‘a couple times’ moments after Jamal leads Veronica on. ‘90 Day: The Single Life’ airs Mondays at 8 p.m. ET/PT on TLC, and streams on Max and Discovery+.