root123, one of the biggest mistakes you can make-- and that will keep you bogged down in infidelity indefinitely--is mistaking your WW's reluctance to divorce for a desire to rebuild or remain in a relationship with you.
Since you've been together since you were both very young, her entire adulthood, social network, and support system have been entirely shaped by and are dependent on her relationship with you. Getting divorced from you would be a cataclysmic change in her entire universe and that terrifies her.
She probably likes you very much. I'm sure she also recognizes that, on paper, you're better "husband/father" material than OM. But I think that if she were to be completely honest with you and herself, she would admit that she's been checked out of your relationship for a long time (probably the "depression" that you observed), is deeply in love with the other man, and, if she were guaranteed that she would lose absolutely nothing by leaving you, she would be with him right now.
Also, almost all WWs who have been caught will vehemently insist that they were relentlessly pursued by their Don Juan of an AP until they finally succumbed to his charms. Maybe that's true in rare cases, but more often than not, it's bullshit attempt to play victim and avoid accountability. In your specific case, I don't think OM dumped his girlfriend to chase after an uninterested married chick; I think it's far more likely that he broke up with his girlfriend because he was already hooking up with your wife... or got dumped by his girlfriend because she found out about it.
I'm not saying this to hurt you but to give you a reality check on your situation and some clarity as to why your wife is saying one thing but doing another. I think a year is more than enough time for her to make a decision one way or another and for you to gage her willingness and desire to break off with the OM and commit to your marriage.
Although some might say you can give her a list of requirements, try the 180, and wait and see some more, as WBFA and SacredSoul said, there are risks involved in continuing to stay. You could be on the hook for supporting a child who is not yours. You could contract an STD (the risk of which is certainly higher, given that her OM engages in high risk behavior). For all you know, she could be accumulating debts or siphoning off money to help him out with his bills and his debt. She might even engage in drug activity with him. And then there's the risk that your wellbeing and health will go into decline from the steady dose of poison you're consuming by remaining emotionally invested in a woman who doesn't respect you and is only staying with you because it's the most comfortable choice at the moment.
Lastly, regarding disclosure to family and friends, I don't know what your relationships are with these people or if involving them would do more harm than good. Some people can be very supportive and will have your back, others will try to stay neutral and play Switzerland, and some people might actually take her side and blame you. But I do think that suffering in silence isn't good for you, so I would recommend that you pick one or two people that you completely trust to confide in about your situation.
Hope this helps.
[This message edited by BluerThanBlue at 10:09 PM, Thursday, April 10th]