Dude, the thing about hooking up with married people... don't. Number one, you might fuck up the other dude's life. If she wants to be with someone else, she could at least have the decency to split with her LIFE-PARTNER first. She married him, that's a promise and a contract. It is irresponsible and disrespectful. Two, you seem like someone that's gonna fall emotionally for a chick you're with. You will get hurt by her bad. She is willing to cheat on the One Man she Married so why won't she cheat on you, just some guy?
Now, I do not have a problem with polyamorous folks or them getting into sexual relationships and emotional relationships with multiple people. That's a valid way of living and loving. But there has to be openness, honesty, and trust there. Unless her husband and you are also both aware and okay with the situation, JUST WALK AWAY.
Old men, fear me! You will shatter under my ruthless apathetic assault!
Uschi - 2 Old Men - 0
"I am convinced that this world is of no importance, and that the only people who care about dates are imbeciles and Spanish teachers." -- Jean Arp, 1921
"If Jesus came back and saw what people are doing in his name, he would never never stop throwing up." - Max von Sydow, "Hannah and Her Sisters"