Postscript: S-JIS and color-coding by WonderBuono; Romaji and translation by arcobaleno.

Translator's Notes: The (Koi nante) lines are actually kind of genius.

The first two come off like "Koi nante isogashii / Koi nante, sou yo isogashii", which means "Love is hectic / Yes, love is hectic" in a pretty standoffish way, like "screw love!"
But the third line reveals that the "Isogashii / Sou yo isogashii" are her saying that she's busy, showing that she's rejecting love with work, as well as saying that love in and of itself is hectic.

There's really no good way to translate this sudden realization, so I left out the () parts.

What do I envy her？
Why am I jelly her？
Re Re Re Remember I'm
Who I am

もう週末のスケジュール
ちょっと突然のキャンセル
どうしようもないほど
あのコ　恋愛体質

(恋なんて)忙しい
(恋なんて)そうよ忙しい
(恋なんて)　そう私は
恋なんてしてる場合じゃないの
そんなヒマは　ないの
しつこい邪魔　やめて
この人生は私のだ

彼氏より　もっと欲しいモノ
私には　たく　さんあるもの
そのため今やるべきこと
あぁ　数え切れない
彼氏とは　今日どこ行くの？
私には　関　係ないけど
少しだけ少し　ほんのちょっと
あぁ　羨んじゃう

ねえほんとに相変わらず
マジでまたまた合コン？
どうしようもないほど
あのコ　恋愛体質

(愛の理由)求めてる
(愛の理由)ずっと求めてる
(愛の理由)そう今時
愛なんて探す時代じゃないの
そんな　軽く　ないの
余計な世話　やめて
この人生は渡さない

彼氏より　夢かなえること
私には　それが恋人
そのため今成すべきこと
あぁ　数え切れない
いい人に　ねえ出逢えたの？
別にどう　でもいいけど
少しだけ少し　ほんのちょっと
あぁ　羨んじゃう

街ゆく女の子の　染まった頬の色
いつのまにか　誰かを羨んじゃう
Ah…
つい忘れちゃうね「私は私」

彼氏より　もっと欲しいモノ
私には　たくさんあるもの
そのため今やるべきこと
あぁ　数え切れない
彼氏とは　今日どこ行くの？
私には　関係ないけど
少しだけ少し　ほんのちょっと
あぁ　羨んじゃう

「彼氏とかとホントいらないの？」
私には夢があるもの
「もしも」を考えだしたら
あぁ　数えきれない
希望に満ちる人生
恋で満たされる人生
いいんじゃない　私は私
あぁ　楽しんじゃう

What do I envy her？
Why am I jelly her？
Re Re Re Remember I'm
Who I am

What do I envy her?
Why am I jelly her?
Re Re Re Remember I'm
Who I am

Mou shuumatsu no SUKEJUURU
Chotto totsuzen no KYANSERU
Dou shiyou mo nai hodo
Ano KO renai taishitsu

([Ya/Su/Ok] Koi nante) Isogashii
([Ya/Su/Ok] Koi nante) Sou yo isogashii
([Ya/Su/Ok] Koi nante) [Na/Ha] Sou watashi wa
Koi nante shiteru baai ja nai no
Sonna HIMA wa nai no
Shitsukoi jama yamete
Kono jinsei wa watashi no da

Kareshi yori motto hoshii MONO
Watashi ni wa takusan aru mono
Sono tame ima yaru beki koto
[Ya/Na] Aa kazoekirenai
Kareshi to wa kyou doko iku no?
Watashi ni wa kankei nai kedo
Sukoshi dake sukoshi hon no chotto
Aa urayanjau

Nee honto ni aikawarazu
MAJI de mata mata gouKON?
Dou shiyou mo nai hodo
Ano KO renai taishitsu

([Ya/Su/Ok] Ai no riyuu) Motometeru
([Ya/Su/Ok] Ai no riyuu) Zutto motometeru
([Ya/Su/Ok] Ai no riyuu) [Na/Ha] Sou imadoki
Ai nante sagasu jidai ja nai no
Sonna karuku nai no
Yokei na sewa yamete
Kono jinsei wa watasanai

Kareshi yori yume kanaeru koto
Watashi ni wa sore ga koibito
Sono tame ima nasu beki koto
[Ok/Ha] Aa kazoekirenai
Ii hito ni nee deaeta no?
Betsu ni dou demo ii kedo
Sukoshi dake sukoshi hon no chotto
Aa urayanjau

Machiyuku onna no ko no somatta hoho no iro
Itsu no ma ni ka dareka wo urayanjau
Ah...
Tsui wasurechau ne "watashi wa watashi"

Kareshi yori motto hoshii MONO
Watashi ni wa takusan aru mono
Sono tame ima yaru beki koto
Aa kazoekirenai
Kareshi to wa kyou doko iku no?
Watashi ni wa kankei nai kedo
Sukoshi dake sukoshi hon no chotto
Aa urayanjau

"Kareshi toka to HONTO iranai no?"
Watashi ni wa yume ga aru mono
"Moshimo" wo kangaedashitara
[Ya/Na] Aa kazoekirenai
Kibou ni michiru jinsei
Koi de mitasareru jinsei
Iin ja nai watashi wa watashi
Aa tanoshinjau

What do I envy her?
Why am I jelly her?
Re Re Re Remember I'm
Who I am

What do I envy about her?
Why am I jealous of her?
Re-re-re-remember
I'm who I am

Ugh, I kind of suddenly
Have to cancel this weekend's schedule
That girl, she's helplessly
And completely focused on love

I'm busy
Yes, that's right, I'm busy
Yes, I am
I don't have anyone to love
I've got no time for that
Stop your persistent nagging
This life is mine

I have so many things that I want
More than I want a boyfriend
The things I'd have to do to achieve them
Ah, there's too many
Where are you going with your boyfriend today?
It's got nothing to do with me, but
Just a bit, just a tiny bit
Ah, I end up feeling envious

Hey, for real, as usual
She's going to another matchmaking party?
That girl, she's helplessly
And completely focused on love

(The reason of love) I search for it
(The reason of love) I search so long
(The reason of love) Yes, nowadays
Aren't we in an era that searches for love?
I'm not that frivolous
Stop with your excessive "help"
I'm not handing my life over to anyone

More than a boyfriend, what would make my dream come true
Is to have a true sweetheart
The things I'd have to accomplish in order for that to happen
Ah, there's too many
Hey, you've met a good one?
I don't really care, but
Just a bit, just a tiny bit
Ah, I end up feeling envious

The girls walking around town with their blushing cheeks
Eventually, I end up feeling envious of someone
Ah...
I accidentally forgot; "I am who I am"

I have so many things that I want
More than I want a boyfriend
The things I'd have to do to achieve them
Ah, there's too many
Where are you going with your boyfriend today?
It's got nothing to do with me, but
Just a bit, just a tiny bit
Ah, I end up feeling envious

"You really don't need a boyfriend?"
Yeah, I've got dreams
If I think about the "What if?"s
Ah, there's too many
A life filled with hope
A life filled with love
Isn't that nice? I am who I am
Ah, I end up having fun

What do I envy about her?
Why am I jealous of her?
Re-re-re-remember
I'm who I am