154. Is it important to be well-matched in social and economic status? 3 (Third Update)

Fang Chengzhi had gone to the countryside as a youth during the era when many city kids did the same as 'educated youths.' During that period, young men and women, spending days and nights together, thus, it was not unusual for romances to blossom. Many of these educated youths found "true love" and got married; however, upon returning to the city, more often than not, they divorced. But why?