I've made a mistake that changed my life, how can I conquer this?

Anonymous
I've been married for three years. My wife is beautiful, smart and she has a strong personality. She is very intimidating and is a hothead. After my wife had our child, we became distant. We weren't arguing or anything we just became distant. The air was depressing and my wife stop being around me. I questioned why, but at that time I thought she didn't know my secret. During those times we argued a lot (A couple of months after having our son) I made a terrible mistake. My work had hired some temporary workers to help around the place and set them permanently if they had done a good job. This girl was hired permanently and she shared an office with me. For the first two weeks, we kept it professional, but she started getting very flirtatious with me. I would dead her attempts and remind her that I was married. She would suck her teeth and laugh. However, I lost my composure. We went on a business trip together for my companies product presentation she had to go along with some other persons. During the trip, I would have to go to her or she will come to mine to go over our speech. This one night, She wanted me to meet her in her room I went, she opened the door and I sat on the couch by the window. When she got out she had on a red lingerie rob. It was sexy and she looked beautiful in it. I felt dirty. I felt wrong. I was there just gazing and she reminded me of the presentations. As she got closer I got hot. She whispered in my ears "What's the matter big boy, can't control yourself?" She kissed me and I kissed her back. I don't know what got into me. We had sex and fell asleep in the same bed. I woke up that next morning feeling terrible. "What did I just do, I broke my wife's trust, I broke our vows". I got dressed left the hotel room and went to mines. I tried calling my wife to talk to her and tell her that I love her because I do and we didn't say that to each other for a while, but she didn't answer. (Look at updates because I'm running out of words)
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Fast forward, the girl told my wife before she left and I came clean and told her that I did. She looked hurt, but she didn't cry. What surprised me was that she was calm. In an argument, she would be the heated one. She took off her rings and started packing her clothes and our sons. While she was packing, I tried telling her that I didn't mean to and that was an accident. She wouldn't let me touch and I told her to stay, but she didn't she drove off and she filed divorce papers.
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I can't believe I'm getting a divorce. I tried talking to her, contacting her but she doesn't want to. Now that we are divorced, I go to pick up my son, she doesn't speak to me only when it pertains to my son well being. I try to make small talk, but she doesn't budge. She seems so much happier. I still love and care for her. How can I forgive myself?
I've made a mistake that changed my life, how can I conquer this?
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