Hi and welcome! I hope you like it here.

I read your post and from what I can understand, your girlfriend senses your insecurity and is taking advantage of it. She should be more understanding of the fact that you're a hard working man, doing your best to provide for her and even for her children. Your commitment and devotion to her is really commendable and she should appreciate it because qualities like yours are very rare in most people nowadays. You shoudn't have to give up what you have to be a better person for her because you're already doing everything you can, she on the other hand is going out to bars and behaving in a way that shows nothing but complete disrespect toward you. You're the one who should be giving her an ultimatum, not the other way around.

I hope you realize that you deserve better than this and your children do as well. You're a person with morals and having your kids exposed to her behavior and all the messed up things she and her kids are doing can have really bad consequences. I hope you realize that.

Good luck!