what should i do, keep it or not??? need your advice.....

Hi 4my1nonly, it seems that your friend really trusts you, since you're the only person whom she disclosed her health condition with. If she had told you to keep it a secret, i think that by keeping it a secret you can show her that you are reliable and loyal to her. Your friend might be very shocked and confused about this illness and that's why she may hold back before breaking the news to her relatives and friends. It is not easy at all. At this point in time, she needs a lot of support, care and reassurance. If you really want to help her, you can share her sufferring with her, by making yourselve available, and listening to her. Then you can tell her all about your concerns, the risk she may incur if she keeps her sickness a secret and other consequences that may arise. You can also suggest to her to try and tell her closest family members or friends, but you cannot force her. I think that the least you can do is to stay close to her, and give her all the support she needs.

Keep her secret. It's her life, her choice how she wants to live it. When people know you're seriously ill, they treat you differently. She's chosen to allow you to know and you can support her, be her support. When her parents do find out (and they will if she is seriously ill - it's impossible to hide forever) they might be angry with you at first. Just remind them that you have been there for her and that you love her enough to respect her choice.