I think I've finally understood it. Frame is when you react to things on YOUR behalf. Frame is when she talks to another guy you don't care. You don't react to her actions, but you react to yours. Frame is actually like indifference. You are your own man, you are isolated from everyone.
When a man loses frame and a woman dumps him, she says "He's not like the man I fell in love with". Losing frame is when you change FOR a woman. A man with a strong frame wouldn't care what his gf has to say. Frame is when you see things through your own lens, your own bubble. If a girl says that your shirt is ugly and you change it straight away - you've entered her frame. Frame is one of the most powerful things you should keep. Losing it will be the end.
This I have learnt from experience. I finally see it. Thank you!