In which way can you best break up with your lover?

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I have seen on many occassions the way my friends have broken up with their lovers.One just simply sent a text to his lover that he could nolonger move on with it,another stopped communicating to her for months but his girlfriend didn't realise this and just kept on communicting to him even though he didn't reply any of her messages.It was until he put it to her straight that the relationship was ended. so how best can one do it?