From the sheet music at Southern Illinois University Edwardsville:


SOMEDAY SWEETHEART
Words and music by John C. Spikes & Benjamin Spikes, ©1919.

VERSE: You told me that you loved me true,
And I believed in you
You broke your vow and now somehow
It seems I'm always blue
But there'll come a day
When you're far away
You'll sit alone and cry,
For me you'll sigh,
And the days that have gone by.

CHORUS: Someday, sweetheart, you may be sorry
For what you've done to my poor heart.
You may regret the vows you've broken
The things you did that made us drift apart.
You're happy now and can't see how
The weary blues will ever come to you.
But as you sow, so shall you reap, dear,
And what you reap will make you weep someday, sweetheart.

* * *
This song has often been recorded as a jazz instrumental, or with only the chorus being sung.
The Internet Archive has several early recordings that include the verse as well as the chorus:
Dolly Kay and the Georgians, 1924
Radio Eddie and Harold Lambert, 1927
Gene Austin, 1927
Georgia White, 1936