The meaning of Stellium  means cluster of 3 planets or more than 3 planets in a particular sign and House.  For example, Moon, Mars, Sun,Mercury,Venus all together in same house and sign

As You have mentioned Leo sign is in 12th house which means Your Lagna(Ascendant) is Virgo which means your 7th house sign is Pisces  and it’s lord Jupiter . Jupiter is posited in 12th house along with Venus, Mercury,Mars,Sun. Your spouse will belong from different state,country and sometimes different community as well. But chances of Foreign land Spouse is much along with career in foreign state because of lagna lord in 12th house. Although, Leo sign in 12th house indicates employment and marriage in different state in the same country. Your Spouse may belong to different cast or culture as well. But this native’s Married life will not much happy as there will health issues and some kind of financial issues as well after marriage. One partner may become disloyal and cheat as well. Chances of separation is also there but Divorce can be avoided and reunion is possible according to this chart.

Although, 12th house represents, sex, bed pleasure and satisfaction and sometime more than 1 affair especially after marriage where native gets sexual pleasure from other people besides his or her spouse which we commonly known as Extra-Marital Affair.

Although sexual and bed pleasure is quite evident in your horoscope and you may also involve some kind of court case, litigation, trouble from hidden enemies as well. Love Marriage is possible in these type of horoscope but weather it will be long lasting or not it’s matter of concern by seeing your 12th house conjunction.

Your D9 chart indicates Long Lasting Marriage but there can be more than 1 marriage or you may marry through court or your marriage may not be social and it may not get accepted by at least 1 family weather boy or girl initially. You may have secret Marriage. Overall, there will be trouble in your married life but the bond of marriage and connection will not break.