Always risky business. Many cheated men and women cannot think rationally and would go too far when hurt. Be careful or get rid of her.
yeah, I'd be careful. She's staying with him for some reason - money or power. That vacation pic says he has some $$$. and if he's old/balding (aren't we all lol), and he finds out about it, he might use money/power to mess up your world. Ya just never know with people. Some girls have no problem just letting another random's dude life get ruined so she can win attention back from her main guy.
So that's just one random getbigger's advice... you have the look and physique to sign up on match and have ten dates inside of 2 minutes... no sense going for a girl with a complex web of lies and scheming who isn't going to leave the older guy, or she would have done it already. The world is scary and info is everywhere. If he wants to use power/money to make your life suck, he can. So I'd just steer clear, create a POF or match account, and go home every night smiling after banging a single girl, with no worries of retribution from a scorned powerful man. great physique and look by the way, can tell you work hard for it.
Walk away from her. Let them work on their marriage. Have some fun without strings or worry. Just my 2 cents.