黑猩猩不小心踩到了长臂猿拉的大便，长臂猿温柔细心地帮其擦洗干净后它们相爱了，别人问起它们是怎么走到一起的？黑猩猩感慨地说：猿粪！都是猿粪啊！ lol

命运 and 缘分 are different. the biggest difference is-- 命运 emphasizes your own life.is something you could change by woking hard. 缘分 emphasizes the relationship between you and somebody or something.and that are arranged by the god or heven.you could chance to meet it or meet it again but you could not try to get it or meet it again.

缘分：注定会相遇的机会 be destined to meet someone or something could be lover，friends，even unknown people；pay attention also could be a thing. You can say: 这幅字画跟我很有缘分，5年前我把它送人了，5年后它又回到了我的手上。

It's really a hard question,thousands of litterateur tried to figure out what the hell is '缘分'.It's a word from Buddhism.I think the easiest way to translate this word is '相逢是缘，相守是分',it means 'Wen you meet her(him),that is 缘.You spend all your life with her(him),that is 分'.But people usually don't separate this word. This word is not only describe you and your wife ,but also describe you and your friend . 我们能在italki相识就是一种缘分.

lot or luck by which people are brought together（from youdao dictionary）