It's wrong for people to cheat on their SO
Will got into a huge fight with his partner, and she insulted him which he considers the last straw.
Will wants to get with someone who respects him more.
Will confronts his partner on her attitude and then decides to end things with her before moving on.
Will gets involved with another woman before leaving his partner.
Will's partner feels guilty for how she treated him while they were together.
Will's partner catches on and blames him for their relationship failing.