Enemies to Lovers by Lani Lynn Vale

Baker Ritter knew how to pick them.

She met the man she thought she was going to marry in middle school, gave him some of the best years of her life, for him to leave her pregnant and alone hours before she’s due to have his baby.
To make matters worse, he brings his side chick to the birth, and she’s left with a decision—fight for what she wants, or cut her losses.
What she should’ve done was cut her losses. What she does instead is take him back and experiences what it’s like to live in hell.
When she’s at the lowest of the low, she calls her dad, an ex-con, who sends the one person he knows that can fix it all.
Copper Clayborne.