I have been living with a man for a year now, I recently went on a two week trip for my sons wedding. When I came back I saw a Facebook message on his page about trying to meet up with an old girlfriend, I have no evidence that he wanted more than to spend an evening with an old friend. And I feel I cannot confront him because I snuck into his Facebook page and found the message so I am guilty of spying on him., help what should I do??

Maybe it's the Facebook's mistake.
To be honest, you'd better tell him what you found by accident. And then, you can conmunicate with him to know his true thought. Please remember, a man who is not honest to you is not worth your attention! Good luck.