Different relationships are different. I do not tell my spouse I'm in therapy, and when I have been in therapy in the past and he did know about it, he was never curious about who my therapist was or what I was doing there. It seems extremely painful to have your partner be jealous of your therapy relationship - I'm sure it is common, but it seems so unnecessary and hurtful.

For me, reading somebody's personal email is a huge privacy violation. I'm really sorry that your partner can't see this, but again, different people have different boundaries.

I think every piece of relationship advice I've ever read, as well as my own experience, says a very strong NO on this one. An expectation that your spouse ought to fill all your emotional needs would place an unfair burden on your spouse as well as on you.

[edited to add: I don't mean to imply that you have that expectation... but maybe your spouse does?]

I'm sorry this has happened to you.