There is an old saying about lying....."The price you pay for lying is greater than others not trusting you; it's that you find yourself unable to trust others."
I think the chicas in CR tell so many lies in their daily lifestyle and see so many others telling lies every day that they either become callous or else they adapt to trusting no one; not even themselves. Sad but true and they become the real losers.
You can also see this situation in the lack of a trusting commerce in Costa Rica. It's something we gringos struggle to accept since we enjoy a rather high level of trust and justice in our American way of life. It's ingrained in our gringo thinking at an early age in America and it's what appears to Latinos as stupid demanding gringo syndrome.
For example: If we call a plumber or electrician in the US, we assume the person who shows up to do the work is capable of doing the work according to the local building codes. Making that assumption in CR is dangerous to your wallet and home. Even asking Tico neighbors for recommendations is no solution since it's contrary to their culture to tell a gringo that the person they plan to hire is incapable of doing the work. In fact, they will likely refer you to a friend whom they know is incapable of doing the work and look at you with a blank face when you complain to them. If there were a website such as "Angies List" in CR that included negative comments about some trades people who were bad, the people making the comments would likely be sued for defamation.
I have no solutions - just these observations which are worth what you paid for them.