Being the woman with my fair share of adopted brothers and male friends, the woman who grew up as a tomboy (not gay) that preferred hanging with the fellas moreso than girls, and also the woman that was recently in the situation in which I suspected that my boyfriend was cheating, I can say that I went to my male friends strictly to better understand why men cheat.
Women cannot answer this question and although I had varying degrees of reasoning why it is possible that he was cheating on me, the men in my life provided me with solid insight to the mind of a man.
Just because a woman comes to you with her problems does not mean that she wants to be with you. I know when I was in the situation, I was stil in love and so hurt that the last thing I wanted was another man, except as a friend.
The thing is, a smart woman would communicate more with a man, instead of a woman, especially when their is the need to understand a man. As much as we think we know men, I am still figuring out the stark differences in the make up of men and women, so I find my male counterparts to be invaluable to have.
My advice to you as the man with the information, is to be honest with her, allow her to be vulnerable with you without fear of you being another guy that will hurt her, and if all else fails, just listen and umm hmm a lot, to show you are paying attention, because ultimately, she just wants to talk and most often when allowed to do so, in a safe environment, we figure it all out for ourselves anyway.