What indicates no marriage or unhappy marriage in a chart?
Sounds ominous but just thinking what would be termed as someone having a 'bad' marriage in store...or maybe a divorce ...or no marriage at all?
The Significators for Marriage are:
5th and 7th Houses
5th and 7th House Rulers
Dispositor 5th and 7th House Rulers (if any)
Planets in the 5th and 7th Houses
and the Signs
and Houses of
all of the Significators
If you're male add Moon and Venus as Significators, but
if you're female add Moon and Mars as Significators.
"Bad" Signs are Gemini, Leo and Virgo
"Bad" Houses are the 6th, 8th, 9th and 12th Houses
A Significator in square or opposition to Saturn is "Bad"
7th House Ruler Mercury in Leo in the 9th House does not mean "NO" but it is an indicator of "NO."
For a male, Venus in Gemini in 9th House Leo does not mean "NO" but it is an indicator of "NO"
For a female, Mars in Gemini in 9th House Leo does not mean "NO" but it is an indicator of "NO."
Saturn in Virgo square Venus (for a male) or Mars (for a female) does not mean "NO" but it is an indicator of "NO"
Moon in Capricorn in the 3rd House does not mean "NO" but it is an indicator of "NO"
That would give us 4 "NO" indicators and so now we might conclude the answer is "NO"
Cancer, Scorpio and Pisces are signs that mean "more than one" of anything.
When those Signs are on the 5th/7th House Cusps, it increases (but does not guarantee) the chances of more than one marriage.
When Significators are in those Signs, it increases (but does not guarantee) the chances of more than one marriage.
Moon in Pisces does not mean more than one, but it is an indicator of more than one.
Venus in Cancer does not mean more than one, but it is an indicator of more than one.
I happen to have Venus Cancer/Moon Pisces and have been married more than once.
Elizabeth Taylor has a Scorpio Moon, 5th House Ruler Mars in Pisces and 7th House Ruler Mercury in Pisces and she married many times.
Note that the 7th House Ruler in a Water Sign in the 2nd House or ruling the 2nd House often indicates (but does not guarantee) that there might be a 2nd marriage because the first spouse died.
A Marriage Significator in the 12th House in square or opposition Mars or Saturn usually means divorce (12th House is Separation/Sorrow) and the likelihood increases if the Signs on the 5th/7th House are Aries, Libra, Cancer or Capricorn, or a Water Sign or other Marriage Significators are in those Signs (those are also indicators of not good marriage).
There are a few other indicators, like Saturn elevated and so on but that should be enough to get you started.