I learned her husband reads all her emails what do i do?

I have a friend that just told me her husband reads all her emails. Well I have been sending her emails at least 3 years. nothing bad just regular emails. I feel spied on. trying to think of what i wrote. Then getting really angry she lets him do that and never told me. I told her private stuff though not for another person to read. I found out last week and still don't know what to do . i seem to be getting angrier and want to holler at both of them but I won't or maybe i should.