Suraj paanch mein sarkar ke ghar duty hoti hai, par love marriage is bande ki tooti hoti hai.
With Sun in the 5th, there is duty in the house of the government; but the love marriage of this person is broken.
The 5th house is the house of romance and love affairs. The Sun represents the government, authority, and ego.
When the Sun sits in the 5th house, it brings a massive professional blessing: The person is highly likely to get a government job or work in a position of high authority ("sarkar ke ghar duty").
However, the Sun's intense heat burns the delicate matters of the 5th house. Because the Sun represents ego, the person's romantic relationships will suffer from massive ego clashes. Lal Kitab warns that their love affairs or love marriages will almost certainly break ("love marriage tooti hoti hai"). They are better suited for an arranged marriage.