The Beauty of the Moment by Tanaz Bhathena 

Susan is the new girl—she’s sharp and driven, and strives to meet her parents’ expectations of excellence. Malcolm is the bad boy—he started raising hell at age fifteen, after his mom died of cancer, and has had a reputation ever since.

Susan’s parents are on the verge of divorce. Malcolm’s dad is a known adulterer. Susan hasn’t told anyone, but she wants to be an artist. Malcolm doesn’t know what he wants—until he meets her.