This should have made us decently aware that Lynn was going to pull her "Paul is made of snow and will melt" stunt when it came time to peel Liz away from the scary outside world and frightening over-stimulation to Elly's womb-like suburban redoubt. It was bad enough that her entitled snob parents don't like the idea of people who have commitments that ain't catering to their whims and thus planting the idea in her head that he would cheat since she buggered off to be with Anthony. Assigning him someone of his own kind is just gross-buckets.
Then again, there's another reason a lot of the men and women who fall by the wayside: a sort of sheepskin psychois that Marian tried to warn Elly about. More on that next.