What does a long marriage line mean?

Short answer: A long marriage line can suggest a relationship mark with stronger long-term weight, but it does not prove a perfect or permanent marriage by itself.

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Read my palm
A close view of the middle of a palm, with the three long creases easy to see

What this means

First compare the line with the whole relationship area below the little finger and any nearby smaller marks.

A long clear line is usually read as stronger commitment or lasting attachment; a long faint line is read more softly.

Direction, breaks, forks, islands, the heart line and both hands matter before making a relationship claim.