Falling Under by Danielle Younge-Ullman

After surviving a turbulent childhood, Mara Foster has finally gained independence and success as a painter. Now in her late twenties, she lives alone, still burdened by a troubled past involving a teenage affair with an older man and the tragic loss of her college boyfriend. But when Mara meets Hugo, the walls she has built around herself begin to crumble. Despite herself, she starts to fall in love and realizes she must either confront her dark secrets or be consumed by them. And either way, she risks losing Hugo and her second chance at happiness