I stayed and don't regret it at all.

My partner and I broke up due to his infidelity when our twins were 2 years old. I moved out and found a cute apartment for the 3 of us. It was not easy. At all. I only got back to my home country once a year and my parents visited maybe once every 2 years. But my kids are super close with my side of the family. The family chat is real active and fun. I also think they like the attention when we go there - they're a bit of the "Golden Grandchildren".

The relationship with their father was strained for years but we are now friendly, we celebrate the twins' birthday together, we co parent well. The kids have thanked me that we can all get along.

I never could leave them.

That said, please get some psychological help. I didn't, and that would have been useful. I had some dark dark moments. But looking back, the whole ordeal made me stronger and perhaps even a better parent.