[29M] [28F] my wife had a drunken one night stand

I 29M found out my wife 28F had a one night stand while on vacation to visit her parents.

Some background. I met my wife in a different part of the country from where I grew up. We have been married for 8 years and have a total of 4 children under 8.

I am the sole provider for the family. My wife and I both made the decision that we would rather her raise our children and when they got older she would finish school and start working again (she just started going back to school this year) our marriage has not been perfect by any means we both are stubborn but there was always love and we both always worked on being a better couple.

We don't have enough money for all of us to visit her home state more then once a year. To make of for this my wife has always flown by herself with the newest baby once or twice extra year. This year was the first year I told her to go alone and enjoy her time with her parents.

She had a 10 year highschool reunion the first night she was back and ended up drinking way to much (normally she doesn't drink at all) she told me she had a Margarita and five shots of tequila during the night and ended up going back to her friends house with her ex boyfriend and she had sex with him. She claims he started it and she just went along with it.

She was very distance from me the whole trip and when she got home and finally broke down and told me the day before Christmas.

I was crushed. She was supposed to be my person, by best friend, my everything and I don't know what to do. If we divorce she will home back to her home state and I will lose my children and they will loose there entire lives and all the friends they have made. I don't know if I can forgive her for what she did. She is very apologetic and remorseful and is acting like the perfect wife for now..... What should I do?

TLDR My wife had a drunken one night stand with her ex boyfriend while on vacation to visit her parents

Edit 12-29-22 I have seen a lot of comments that she blamed being drunk for the cheating. I should have made it more clear. She has not used it as an excuse once. She took full responsibility for it. Also I will not be making any decisions on what I will do until I have had some time to process all that happened and all your wonderful advice. As well as and much more importantally talk to some real professionals legally, spiritually, and emotionally.

Thank you for all the comments, words of encouragement, and advice. I will update again once there is more to tell.