Another Life: a Second Chance Romance (The Second Chance Series) by Cynthia A. Rodriguez

Sabrina Milas doesn't have time for regrets. After marrying the man she thought was a safe bet, she's back on the proverbial market with two kids in tow. Ever the dependable one, she can't help feeling like she's letting everyone down. And when she runs into an old flame from the one time in her life she allowed herself to be wild and free, she has to acknowledge mistakes made and promises broken. Their scorched past leaves little room for a warm reception between the nearly disgraced professor and his undergrad lover. Now Sabrina has to come to terms with the one who got away no longer staying away.