Im gonna disagree with Karen on this one (Sorry Hun! ). I think she is right in saying that this is not your fault but im not sure that this is a co-incidence. It would be impossible for an interaction between two people not to have an effect on both people. For example... if one person tells a funny joke: Both people laugh and feel happier. If someone is supporting you then I think its important that someone else is supporting them. The problem probably isnt as big as yours was but sometimes friends can need time to re-adjust their minds or even a course of counselling.
I hope what I have said makes sense