Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: I know the widespread opinion on unfaithfulness but try to hear me out first.

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First off this isn't an AITA for having cheated, that's clear and not up for debate. I've long accepted full responsibility for it in person, 2 days after it occurred. I then explained that I was unhappy with our relationship and thought we should see other people. She was naturally upset and I offered to leave or call her a friend, but she asked me to stay and we decided to grab dinner to recount old times and cement/celebrate our transition of relationship into friendship.

Afterwards we naturally saw less of each other but still hung out regularly and got along well. Things quickly devolved. I can't be sure why her attitude towards me started to change, but my best guess is she was getting over the realization of "we've broken up" and into "he kissed another woman".

She began to vocally berate me whenever we were in a room with friends, would tell me graphically about the other men she was having sex with and would take pride in the fact that I hadn't seen anyone since the breakup. She would also lie about what she'd told other people, leaving me unsure what my friends were saying behind my back. 

I understood she was hurt and considered this fair game until a mutual friend messaged me while I was out drinking and I (stupidly and drunkenly) responded that "I was going to pretend not to have seen it" given she was a close friend of my ex and seemed wildly flirtatious. I then passed out for 8 hours.

I woke up to a shitstorm on every platform imaginable from both Friend and Ex. I apologized and tried to explain that I must've misunderstood the context of Friends message, but Ex was having none of it. I offered to three way video chat so we could all work it out. Ex replied that there'd be no point, as I'd probably just invalidate everything she had to say.

Seeing as we were at an impasse, the conversation ended. A few hours later friends began asking me about Ex's posts on instagram detailing "some people" are never meant to be trusted and "some men" are just scum. Taking polls on "how she should kill her ex's Sim" and "how to destroy all photos of us." A few minutes later I received the message that she was ready to talk.

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I consider myself a patient man, but this was where I drew the line. It's normal for her not to forgive me, but I'm tired of being walked all over and its become unambiguously clear she was never going to stop. So I told her that it was probably best we went our separate ways and. I explained I didn't hate her, but I certainly didn't like her anymore.

Over the next 24hrs I received numerous "heartfelt" apologies, I ignored them. 48hrs later her spiteful behaviour returned with a vengeance, and I've since had people I've never even met grimace when I introduce myself due to having met Ex first.

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AITA for deciding to break off contact, or was it the right thing to do?

cutting contact with my ex-girlfriend a month after having cheated