Looking at your Horoscope we see that your Ascendant is Sagittarius, that means that 7th house which is the prime house of marriage is ruled by Mercury as Gemini sign is there. You have the 7th house under the influence of the Rahu – Ketu axis, which is not good. You also have Mars in the 7th house making you mangalik. Sun which is a cruel planet is also in the 7th house. Your 7th house and 7th lord is weak and you have lot of affliction on the 7th house because of which you are facing problems on the marital front.