causes
You can get Chlamydia from having multiple sexual relationships in a short period of time. Only one of your partners has to be infected for you to become exposed. Even if you have only one partner with whom you are sexually active, if they are infected with Chlamydia you are very likely to become infected too. Why would you not tell your partner you have the disease? Some people just don't know that they have it due to no or very subtle symptoms, causing infected people to pass it on to others. But say you actually did have some symptoms...