<human>: I cheated on my GF/wife the first week we became official. We were dating/seeing each other for about 3 weeks before hand. She decided to continue the relationship and give it a chance. We got married rather quickly but a big reason was to get her papers so she could stay in the US. Everything about the relationship is amazing and she really is my best friend. 

In the past she has expressed to me that she still feels very bad every time she thinks about it. She can't help but wonder if I am actually going to work or seeing someone else (I also travel a lot, so no help there). I think it has been eating her up inside for awhile. 

Let me get to the reason I am asking for advice. Today my wife has broken down from feeling very insecure and hurt about what happened. She has said, "We are going to break up if you can't find a way to make me feel better about this." Not word for word but something along those lines. I told her we should go talk with someone about it, and she said, "Why do you need someone there to be able to talk about this. You need to make this right." She hung up the phone and will probably not talk with me until we both get back from work. I need any advice on how to make her feel more secure and to eventually heal from this. Anyone who has been in a similar situation, what are the things that helped you heal? What did your SO do that made you feel better about this? I feel like I am losing her and it's killing me to think that this might be it. How do you make someone understand this if they can't trust anything you say in the first place?

I know its hard to give sound advice without knowing everything but I really have no idea what to do. I feel like I have tried really hard to be as open and honest with her to bring back that trust.

I can give more information or background if needed.

Can you give me the gist of the text in a nutshell?
<bot>: Cheated on my wife early in the relationship. She has not been able to fully forgive me and it is starting to destroy the relationship and possibly end it.