If Nepal is allowed to borrow 1.3 Trillion its economy will collapse. They wont be able to pay it back because they have a weak economy and the interest rate the have to pay will be very high. This is how the crisis in Greece started, Germany allowed European countries to use its credit rating to get low interest debt, and they wont on a spending spree borrowing more than they could handle.
There is a reason why some countries like Germany and US have high credit rating. These countries have a good financial track record, they are very developed and highly advanced economies, if you invest in their government your are almost certain that your investment is safe. If you invest in Pakistan there is no guarantee they will pay you back in time.