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I use the term "dirty" in the context of pursuing someone who is supposedly committed, and then somehow expecting them to NOT do the same with you. "Dirty" in the sense that engaging this way demonstrates a lack of dignity, integrity, and respect (for the other and for one's self in not ending the relationship prior to seeking outside it).
I think that's a bit of stretched conclusion. People monkey branch. Not all of them, but I'd say most.
There's a difference between pursuing the town slut who's now "committed" to someone, and pursuing a random girl with a boyfriend.
If your relationship goes bad, sure, she might start looking for other options just like she did when you met her. But that doesn't happen overnight. People know when their relationships are dying. They just refuse to accept it. Some become complacent, others are just resistant to change. Either way, if you're prolonging a dying relationship which eventually ends in being cheated on is, in my opinion and to a relatively high degree, that's your own fault.
We all know women break up with you in their mind long before they do it in person. Nobody ever thinks "this is such an amazing man and I want nothing more than to spend my life with him. But hey, once a cheater always a cheater, so, fuck him."