Reddit, what do you consider as "cheating"?

So, my (ex-) girlfriend thought that when she got drunk and made out with someone, that it is not considered cheating. I thought otherwise, and she had done this twice, and even tried hiding it until one of her friends told me her secret. Now recently she told me that early on in our relationship, she would hold hands with the same guy, and she did this because "I wasn't giving her the attention she needed." She then later on tells me that it's not cheating at all. Well, everything she did was cheating, and she cried when I broke up with her. Now what do you consider as cheating and how did you deal with it?