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In the lyrics of [三十路岬](https://www.utamap.com/showkasi.php?surl=B25323),

> みつどもえの泡と知りもせず
>
> 愛した罪は消えないの
>
> 誰を選ぶか決められないと 別れ上手なひとでした

There is this occurrence of みつどもえの泡, which I couldn't find a dictionary
translation of. The first line seems to translate to

> Without even knowing みつどもえの泡

(which is kind of ironic, since I don't know what みつどもえの泡 means...)

I do know what みつどもえ (三つ巴) means. It's this pattern:

[![enter image description
here](https://i.stack.imgur.com/MJeVKm.png)](https://i.stack.imgur.com/MJeVKm.png)

But what does bubbles (泡) have to do with it?
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question
translation song-lyrics
What does みつどもえの泡 mean?
三つ巴 is one of traditional family crest. Soga from Sagami and Utsunomiya from
Tochigi were probably the original authors. There are many variations,
original one is heading clockwise, another the version of the counterclockwise
is called 左三つ巴. This has been famous which had been used by 新選組 土方歳三.

三つ巴 also has some imprecations, one is the three clans are struggling for the
supremacy and contain (a hostile power or ideology). In the middle of these
powers, one would very difficult to get another. The place looks like this is
a vortex has bubbles at the center.

When you play じゃんけん the system looks like this, but it has another name.  
See also 三すくみ
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2020-05-16T23:46:58.097
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三つ巴 originally refers to that emblem you found, but in modern Japanese it
mainly means "triad", "three-way" or "threesome" (e.g., 三つ巴の戦い = three-way
battle). In this context 三つ巴 refers to the "love triangle", which is suggested
by lines like 誰を選ぶか決められない. In this song, she is regretting that she was
involved in cheating without even knowing it.

泡 ("bubble/foam") has long been a common metaphor for ephemeral/transient
things in Japanese.
[うたかた](https://dictionary.goo.ne.jp/word/%E6%B3%A1%E6%B2%AB_%28%E3%81%86%E3%81%9F%E3%81%8B%E3%81%9F%29/)
is a more poetic equivalent. Many people have compared bubbles to love, dream,
[economy](https://en.wikipedia.org/wiki/Japanese_asset_price_bubble) or even
our world itself. In this context it is used primarily as a metaphor for
ephemeral love, but of course it's also a reference to the sea bubbles she is
actually seeing.

Therefore 三つ巴の泡と知りもせず愛した roughly means "I loved you without knowing this was a
love triangle".
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answer