Lyric discussion by ladyboygrrl 

Cover art for It's For the Best lyrics by Straylight Run

and i've become content with this life that i lead where i drink to much and don't believe in much of anything and i lie to myself and say "it's for the best."

i agree with the break-up idea, but i think the above part is just about apathy. to me it means slipping into a state where you don't really care, there's nothing to believe in and you try to convince yourself that you're happy like that.