Relationships/marriages are a huge responsibility
In the case of Unfaithful, Connie cheated on Edward because he wasnt showing any type of affection towards her. Edward was emotionally dry. She was bored of him. Paul gave Connie what she was missing in her marriage (sex, attention, emotional validation).
Connie's infidelity is understandable. She didnt do it because she's a b!tch, whore, she's better than him or out of revenge. Edward wasnt looking out for her needs, so she went out to get hers. The more Edward was dry, the more she comfortably went to see Paul. Connie may have done "wrong" of cheating but I dont blame her. Edward failed as a husband to keep her there..
I've been in Connie's shoes but I didnt cheat, I thought about it but instead I took the time to be away from her and take care of my priorities (school, job, gym, hobby), a peace of mind, and not call/text her. I gave her a week to think what she wants to do with me and eventually we broke up on a good note. I held no grudge, no hard feelings, no headaches.
Being in a relationship/marriage is a huge responsibility.