<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'm a 29M, I met my wife in high school. We've been together 10 years, and married 3. Shortly after we got married, I found out she had been having an affair with an older man when I borrowed her phone. We had a big blowout of course, but ultimately went to marriage counseling and decided that we would stay together. It's been really hard for me to trust her again, but things have slowly gotten better. 

Recently she has been very upset/depressed nearly every night. Apparently she told her best friend about the above infidelity and said friend took it poorly. We started talking about this when it came out that the real reason she was upset was that she had been talking to man she had an affair with all along, but recently put an end to that so that she "could be a better wife". She said she was upset because she was "mourning the loss of the relationship" with him.

I should say, I really love my wife. She is my best friend, and I truly cannot imagine life without her. This scenario though shakes the already unstable foundation of our marriage by erroding what little trust we had left. I feel like she doesn't really understand the gravity of the situation yet, and we haven't really talked about it. I haven't talked to anyone except reddit yet, because I don't want my friends to think less of my wife. She says she wants to make things better, and that she is trying to do the right thing. She said that she has not had sex with this person again (since three years ago), but clearly has an emotional attachment to him. 

I'm just so confused and hurt, and I have no idea what to do. I love this woman to death, and I would do anything for her. I want nothing more than to have a normal marriage with her, but I increasingly feel that this is impossible. I'm not sure I can withstand being hurt like this again.

Advice?
<bot>: My wife had an affair 3 years ago, right after we got married. I thought we were over it and we had recovered, but she has still kept contact. I'm confused and don't know what to do.