Nobody said it was easy
It's such a shame for us to part
Nobody said it was easy
No one ever said it would be this hard

from Coldplay – The Scientist Lyrics on Rap Genius

Meaning

When two people are truly in love, break-ups, no matter if mutually agreed on or initiated by one party to another, are rarely smooth and are often tinged with regret.

It’s hard to keep the relationship, but it’d be sad for it to end. He just wants her to try this all over again because although the relationship and frustration is hard to deal with, parting ways hurts worse.

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