It is impossible to keep regular exercise and adjust diet every day, it is just a matter of speed. Exercise and dieting have rebounded rapidly, it must be because you didn't insist.
All weight loss methods will rebound, including liposuction and body shaping. I think this is not a rebound, but a process of fat regrowth.
Your flesh didn't grow in a day. You can't lose weight in a day. Plastic surgery has many sequelae, not to mention that you say you are not ugly.
If your mouth grows on others, even if you become a peerless beauty, someone will say you. Why do you care so much about other people's eyes? Everyone can't love you. Learning to please yourself is the most important thing. Losing weight is not for others.
It's a pity that you met someone who doesn't deserve to be a teacher at all. I hope you can carefully consider your direction. The article is beside the point, but I really want to say