I am sorry that this happened to you and to your friend, Milly. You are not a bad friend because you didn't know. I am sure that she must have gone to great lengths to keep these things from you; this is often the case. It can be very, very difficult to disclose these things, even to a close friend.
Please give yourself acknowledgment for having been her friend during what must be a very tough time for her. Even though she wasn't able to disclose, I am sure that she got a little boost and some comfort just being with you and knowing that you were her friend.
((((((((((((((((((Milly))))))))))))))))))))))
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