It's Simple, You Want Revenge,So Do I

When boxing trainer, Alexia , finds 3 years champion of illegal boxing , her boyfriend of two years,named Jacob, sleeping with her closest what does she do?
She finds a boxer, named Zac, who nearly beaten Jacob last year, and she trains him to beat Jacob in the ring.
They spend time together and grow close. They also feel a strong attraction to each other.
But with Zac keeping secrets about his past.
What will happen?