Was the ''forever girlfriend'' phenomenon common in the old days too?

I know the reasons seems to be happening for the past decade. There are some unfairness going on and if only one person benefits, then it's a risk for the other.

Was maintaining a relationship forever a common thing in the old days too; in which the girl finds herself being a guy's forever girlfriend and there are no plans of ever forming a family, no timeframe (or it gets postponed), no nothing? The relationship is only superficial; going out on date, living together, cooking together, go out hiking, frequent sex, romance, saying ''I love you'' to each other, etc but nothing serious... and it stays at that position for 5-10 years; going nowhere.
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I think some additional things favoring only one person is making it hard for relationship to actually progress. I've seeing this phenomenon in Spanish speaking couples too; 8 years wasted of nothing.
Was the ''forever girlfriend'' phenomenon common in the old days too?
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