All the fear mongering messages telling TS to prepare to pay alimony, wife is having affair, etc. is not helping, and it is detrimental to TS' mental wellbeing.
TS, you need to understand that 冰冻三尺绝非一日之寒 and you need to hear the truth.
Frankly, to allow things to escalate to this situation, you've been taking things for granted.
Perhaps this is your way of showing love, care and concern, by being over protective; or it might be because you are not having any fun or social life, so your wife couldn't have it too - because it is not fair to you- you are caring for the kids while she is having fun.
While we judge ourselves by our intention, others judge us by our action - and hence in your situation, your wife thinks that you are being too controlling.
I strongly encourage you to take your wife's words at face value - because you need trust to continue the marriage.
Talk to her.
You can wait for her to return from her OT at work, or from her outings with her friends to talk to her, or funny as it may sound - schedule an appointment to talk to her.
Think about the agendas you want to talk about and try not to be judgmental about her new lifestyle which she attributes to work, because your primary focus here is to win her heart back.
You might want to try and start the conversation by sharing with her that you have thought about your own actions and agree with her that you've been too possessive and have hurt her during the process but emphasize to her that you still love her very dearly and you are willing to change for her.
Offer consensus like - understanding that she is in a new company and will need some time to get accustomed to her new role, new responsibilities, new job scope, new office culture, new team and etc., hence you agree that she can hang out with friends and colleagues. She needs to feel empowered.
Speaking of which - when was the last time your had a meaningful conversation with your spouse?
Use this opportunity to make some changes to your interaction and lifestyle with your wife.
I do not recommend mentioning kids during your conversation as some may view kids as emotional baggage.
Reminisce the younger days you spent with her and I am hope the conversation will flow well.
Take care TS, you can do it.