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How about Linton Heathcliff and Catherine Linton, from Wuthering Heights? Their relationship was unhappy and unsuccessful, if not immoral (other than Catherine's being forced into it).
La Dame aux Camélias by Dumas would seem to have the elements you want, other than being French (but it was well-known in England). However, while I assume Marguerite Gautier, the courtesan, was older than the youthful Armand Duval, I don't know this for certain. On thought, it also has just two of your three elements: it was unsuccessful and immoral, but happy.
This is a fun question!
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