<human>: Provide a brief overview of the text.

A little while ago I picked up my now ex's Ipad and it had Facebook open.
I saw a conversation that she was having with a guy that was hitting on her and she was saying things like "You're a really nice guy, I would be lucky to have someone like you" and "If only you lived closer"
When I first confronted her about it I asked if anyone was hitting her ( just a general question, not mentioning what I saw) Her response was "yes but I let him down". I didn't see anything telling him that she wasn't interested.

When I told her that I saw the conversation the first thing she accused me of was hacking her facebook and that this is the best way to deal with this guy was to go along with it, because he only becomes interested when she is in a relationship and he will never do anything about it.

Anyways fast forward into the future, we had many fights over it and I felt that I was never able to express how i felt without her thinking I was having a pissing contest on who has hurt who more.
Now we have just broken up a few days ago but I can't stop thinking that maybe she was telling the truth about him and she was just trying to shoo him away without causing issues.

I feel really heartbroken and am blaming myself and I don't know why
<bot>: I feel like I've thrown away a good relationship because she was cheating but did it so she wouldn't hurt another guys feeling and I couldn't get it off my chest.