What do you do if men keep disrespecting you after first being nice and seeming curious or interested?

I had a boyfriend who kept saying I’m so pretty or beautiful. Then he started saying I need to lose weight and get plastic surgeries. Mind you I am borderline underweight. All my life guys have been critical of my body appearance and I’ve been made fun of by guys.

What do you do if men keep disrespecting you after first being nice and seeming curious or interested?
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