A2h,
"If you can live without her, man up and cut her off. Don't string her along "
You guys think this is true or just a good line for a movie
It really depends on the context of the quote. From the last part saying, "don't string her along," it almost sounds like the quote might be saying "don't keep seeing and sleeping with a girl who wants something more from you when you don't want something more from her." In that case, the quote is correct. You don't want to set incorrect expectations for a girl and have her be hurt in the long run (if it's avoidable).
Of course, if it's also implying that you should only be with a woman if you
can't live without her, then, as Zphix mentioned, it just means you're probably super clingy and need to work on yourself more to become an independent man that can live his own life regardless of the women that come into it and/or leave it.
- Franco