This is genarally broad question will have to answer in detail .
basic theory says that a house which is occupied by malefic loses its virtue .
as u know malefics are saturn , mars ,sun . rahu , ketu .
above is very very general one . but deep analysis will alter the rule .
not all ,malefic are bad , there is a term called yog karagaka , for each asc yog karak is different . for eg if you take cancer asc mars is owner of 5 and 10 . though he is malefic by virtue of owning kendra and trikona he becomes benefic . . he does good only .
for sagg asc mars owns 5th house so he is does good .
malefic planet owning kendra trikona houses does good . but they should not own evil houses at the same time . eg 9&8th , 1&6th , 5&12 etc .
for you saturn in 5th is good for spiritual , disciplined structured life . sober , serious person , responsible dutiful . for you there is no room for fun and amusement . even in relationship you are serious . lack jolly mindset . thats only reason relationship suffers .
if jupiter aspected saturn then things would have changed . jupiter would have reduced the ill effects . then also base effects are present . jupiter aspects ,makes saturn optimistic , some what jovial , generous , philosophical . over giving nature . charitable mind .
nak constellation also plays major role . planedts palced in enemy , malefic nak wil cause damage more . eg 7th lord in ketu nak (aswini ,maga , moola ) spoils married life , first of all there is a big question is on whether person marries or not , 90% of these people prefers lonely life than being in committed relationship , they cant hold that lenghty band . its hard for them , breakup and hook ups happens here often . for them marriage is some thing like hell .
any lords placed 6, 8 12 th lord nakshatra problem . be prepared to make you strong to face those challenges .
3.10, 11 th houses are upachaya meaning things improves with time any kendra trikona lords placed in these houses or be in their nak constellations will improve as age progressed . be patient.
as dictum goes saturn spoils the house where he sees and jupiter aspected house floruishes its very true .
fro you saturn in 5th , from 5th it aspects 7th house of marg and patnership . hard to digest but its true , married life is not cake walk for these persons. though they may good by nature , their spouse has lots of negativity to pour upon the native , due to their negative approach , this people too will made to act in that way . so end result is either break up or cold war . partner has low qualities and comes from poor background .
from 5th aspects 11th house of friends and elder siblings . person has many bad friends who cheats him , hate him, will do all under ground job to put native down . person gets cheated in money matters by friends , elder brother either not present or will cold relationship with them ... person either cheats elder bro or gets cheated by them .
lastly aspects 2nd house of wealth family and speech . one of the foremost reasons for poverty along with 11th house aspect , second house aspect spolis both incoming and stored wealth . besides that person spoils his life by his own speech , if he speaks one thing people will assume different meaning thereby it causes verbal war . so be careful with speech . family life suffers with lack of peace , no matter how much hard you try something pulls your legs off , whole life spent in search of money and domestic peace . chances of having bad habits . person cant his meal peacefully after long hours of working . uncaring unloving nagging spouse makes native sad . so he spends most of his day in out only . for him home is wild animals den . afraid to come to home ...