My GF is sleeping with her coworker

So me and my gf had been flirting with the idea of cuckolding. This weekend we were drunk and she admitted that she has masturbated multiple times to her coworker. I thought it was hot in the moment and encouraged it. We even had sex to the thought of him fucking her.

For context, she works in a team (it was a team of 3 until the other guy left, leaving her and the guy she likes). Every Thursday the three of them would go out for drinks but now that it’s just two, they went out together for the first time.

So like i said earlier, I encouraged her to hook up with him over the weekend but we later talked about how it probably wouldn’t be a good idea since she has to see him everyday.

To my surprise, she came home super drunk at around 4am yesterday and said they hooked up. I don’t know how to feel. I did encourage her so I probably should accept it and not blame her.. Any advice?