Jsmjsm:
I am a big dom guy,
Recently and after a chain of events I found myself really turned on by the idea of my fit girlfriend going with fit guy.
Nothing else turn me in since we have talked about. She did it twice with the same guys but she doesn’t want to be the only thing between us.
I am scared of loosing her
I am so lost
So, let me make sure I understand you.
You're a dom, but you get turned on being cuckolded by fit guys. Your girlfriend indulged in this fantasy for you a few times, but ultimately decided it's not for her.
You don't know how to indulge in this fantasy and keep your girlfriend at the same time, correct?
Kink negotiation is super important. And you need to realize not all kinks will be shared. Sometimes the other person is open to the kinks. Sometimes they aren't.
Your girlfriend seems to love you. She probably feels uncomfortable sleeping with someone else while she's with you. But she gave it a try to make you happy.
You're cuckolding fetish is best left in the fantasy realm. Have a talk with her. See if there's any way to incorporate that with your bed room activities. Do not try to persuade her. Just see what she's open to doing.