Looking at your chart we see 7th house in Rahu – Ketu axis and Saturn aspects the 7th house. Saturn is in Shatabisha Nakshatra ruled by Rahu. 7th lord Mars in 11th house, indicates the strong need to do proper matching of the horoscope before marriage.
When 7th house is under Rahu – Ketu axis and Saturn aspects the 7th house and the 7th lord Mars, like in your care, you can expect delay in marriage. Marital instability is due to expectations in marriage are very high. Ketu can bring detachment and difficulty in understanding the partner emotionally.
Remedies for Ketu, Saturn and Venus should be done.