What do you think is the best way to handle an OM, an EA?

I'm pretty pissed about it. The OM is my cousin so I'm feeling doubly betrayed. My W tells me it is only a deep friendship with no romantic part to it at all. She says its a friendship that helps her navigate her way through a mid-life crisis. Yet, they spends hours every day speaking on the phone, take day trips together, she stays at his house out of state, and she buys him gifts. When they talk it definitely sounds flirty, but no obvious romantic wording.

My W has made it clear she is in the midst of a full-blown life crisis and while removing herself from those she is closest to - H, sons, family, close friends; she maintains friendships with those that satisy her needs in this present situation.

All of that sounds believable theoretically, but it's tough to be relegated to the bench while my W carries on non-stop with my cousin.

Despite the pain I am still GAL, and taking the high road throughout this, and doing a lot of self examination. What's also tough is being the only one DB'ing. Everyone else thinks she's being incredible selfish. I, however see her pain and keep taking the high road and DB'ing. But, god do I have my moments of doubt!!!!!

Any opinions? Thanks!
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M - 24 yrs
H 53, W 45
sons - 24,21, 13
bomb - March 2011