gf gonna hook up with someone as a revenge?

Hey,

I was always into trying threesomes or letting my gf sleep with others, but as much as this idea is attractive to me, im scared to do that and im very jealous. Idea of her doing it is the most attractive thing ever, but should I try to push it further?

Her stance is neutral, she said sleeping with other guy wouldnt mean anything to her. But I always wonder how will she act after it? How will I feel?