You cannot drive someone into the arms of another person --- you cannot make someone cheat on you. So get that notion out of your head. How dare she guilt you into accepting HER responsibility.
This is what a RESPONSIBLE person would have done in her position. She feels neglected... she tries to sit you down and talk about the relationship. If this doesn't work... then she may try a few more times to get your attention. If this still doesn't work... then she will break up with you and finally have a chance to explain to you about all the neglect she had felt. At that time... it would be determined if the relationship can be salvaged (because you finally gave her a chance to get through to you) or a reconciliation is not possible.
An irresponsible bitch would go out... spread her legs for another man while still with you... tell you that she's found someone 'better' than you... and then cruelly try to guilt trip you into accepting the blame. Thus this woman (hate to accept her as part of my gender) has not only been unfaithful to you... but she has the audacity to make you accept responsibility for it.. which is outright bullshit.
If you were neglectful.. then learn from it.. but don't you dare think it was your fault she chose to cheat on you. What she did was far worse than what you may or may not have done.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen