Jupiter is the presence of divine power in your horoscope and has lots of importance in leading a good life.
Jupiter just like any other planet plays its role depending on its lordship for Capricorn ascendant Jupiter is a first-rate malefic and gives troubles in its periods.
But the most unique and natural characteristic of Jupiter is that it tends to destroy the significations of the house where it is sitting out of which its effects on the 7th house are most mysterious and debatable, especially for females.
Jupiter is the significator of the husband in a female horoscope and gives bad results in marriage when placed in the 7th house.
This happens beacuse of "karko bhava nasho" where a significator planet sits in the house which represents the same signification.
In a case of male same is done by Venus in 7th house but Venus in 7th has less damaging effects than Jupiter in the 7th for females.
This is because Jupiter tends to destroy the house where it is sitting.
Therefore Jupiter acts two-fold negative in the 7th house for a female.
There are many examples of females where Jupiter in 7th has created a lot of issues in married life.
You can check examples of Medha Patkar for that.
She have a exalted Jupiter in her 7th house which is giving rise to the Hamsa Yoga.
And, back then she was a big deal for her Humanitarian & Environmental works.
But same Jupiter in the 7th house affected her married life badly.
Jupiter in the 7th house is one of the placement which gives issues in marriage.
In the same way, in many other women with Jupiter in the 7th house, lots of marital instabilities are seen.
Since the exmaple I have used is a well known personalities it's better to analyze their horoscope otherwise I have a few other horoscopes which I can put here to show Jupiter's bad results in the 7th house.
When Jupiter is in signs of Taurus, Cancer, Virgo, Scorpio, and Pisces in the 7th house it leads to a lack of love from the husband and the husband treats them badly.
Unmarried women with Jupiter in the seventh house in signs stated above tend to get married late in life and sometimes do not want to get married.
But this is only one side of the story Jupiter in the 7th aspecting ascendant gives them a very spiritual and Noble personality especially when Jupiter has benefic lordship, it also leads to a successful career and money.
Condition like retrograde Jupiter, combust Jupiter, low or high degree Jupiter and aspected by malefic cause more problems to it.