be with是指和默认在一起，场景叫宽泛，live with就是和谁生活在一起
live with means =share a home and have a sexual relationship with (someone to whom one is not married).
"Fran was now living with a man fourteen years older than her"
live with also means = accept or tolerate (something unpleasant).
"our marriage was a failure—you have to learn to live with that fact"
be with means=To date or be boyfriend/girlfriend with.
eg.I've been with her for almost a year now
It also means=To disagree with someone.
eg.I'm sorry; I'm not with you on this point.
It also means=To understand someone's point or intention.
eg.I came in here disagreeing, but I've changed my mind, and now I'm with you on this.
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