If he doesn't come back to you then it was never meant to be
A guy who doesn't come back is not "the one".
「戻ってこない男は最初から縁のない人」＝ If he doesn't come back to you then it was never meant to be / A guy who doesn't come back is not "the one".
ボキャブラリー
come back ＝ 戻ってくる
never meant to be ＝最初から縁のない
not "the one" ＝ 運命の人じゃない
guy ＝ 男・男性
イギリス 
