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I want to say that "as A becomes closer friends with C, B gets jealous and A
and B drift apart". What I have so far is A-さんは
C-さんと仲良くすればするほど、B-さんがうらやましくなって、A-さんと_____てしまう。
CC BY-SA 3.0
2015-03-17T23:26:52.273
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2015-03-18T01:09:25.343
9635
question
words
How to say "lose a friendship/drift apart"?
「距離{きょり}を置{お}く」

would fit this context.

If the separation is more passive, rather than intentional/active, then

「離{はな}れ離{ばな}れになる」

These are expressions for drifting apart. "Losing/ending a friendship" has
much different expressions.

「縁{えん}を切{き}る」 「関係{かんけい}を損{そこ}なう・失{うし}う」 「～はもうおしまい」
CC BY-SA 3.0
2015-03-17T23:38:35.977
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2015-03-18T01:09:25.343
2015-03-18T01:09:25.343
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answer