BigCityLightsGrl, I do know what you mean. I admit to being pretty naive about Craig's List, so I don't know all the things it is used for, but "communicating with" doesn't mean making dates with, necessarily.
But you see, I would go one step further because of my own sensibilities. Yes, it's hurtful and unhealthy for a spouse, boyfriend, girlfriend, fiance to cheat on you, but imo, why the special attention to whether it's with both men and women? IMO, if it happens that DS II was looking to hook up with men, that isn't in itself a reason for condemnation. Some people are bisexual, and what's it to me?
Now, I do understand the idea that, if DS II's social circles are homophobic, then he would have a reason to conceal his sexuality; and, thus deeply closeted, he could react violently to the threat of being outed. MOO
To me, that just one more indictment of societal attitudes that force people to conceal a basic, natural part of themselves.
This is all totally my own opinion, and I realize there are others who disagree.