Preguntas sobre ejemplos de oraciones con, y la definición y uso de "Lylic"

Q: " lylic" how to pronounce

Q: I am translating a lylic, BY THE SIDE OF THE MILL from an operetta, THE RED MILL.
I have some questions below：

MEN
Girls, as you know we are wed alone to art
ねえ、知ってるだろう、僕たちがどんなに絵を描くことが好きか。

and it breaks our heart but we have to devote all we own to art.
芸術は僕の胸を張り裂きそうにもするけど、僕の持っている全てを芸術に奉げなければならないんだ。
→What does break their heart ？ art？ or girls row? Before this lyric, GIRLS asked them to stop drawing according to the lyric that I attached.

So like the best of good friends we have to part.
だから親友のように別れなければ。
→from what ? from art? from GIRLS？

But to ease the smart let us try to forget that we have to.
でも、この心の苦しみを和らげるためにも、その事は忘れよう。
→What does they mention as the smart？What do they have to ？

Thank you in advance!