My [25m] long distance Gf [25f] does it for the first time [ cuck’s perspective ]

So to clear it out, I am 25 and I am double timing right now, got a gf here with me while there's a friend from childhood with whom I used to talk time to time. She and I got a bit close some 2 years ago, have met after that for a few times. Have had sex.
She too got a bf back home. The two of us were just going with the flow.
I have always been into cucking. There's something about it that excites me. The mental aspect I guess.
The girl I got here is pretty and all but the one from my childhood is damnnm hot. She got a great good athletic figure too
We were talking on call today as usual. When she told me that she is going out tonight. I thought it must be the usual but she never really talked about it like that. She further told me it's her colleague.
I kinda expected her to fuck around with me and her bf back home .
Like both of us met each other while we both were going through rough patches in our respective relationships.
But tonight she told me that she is gonna fuck her colleague. I too fuck other girls sometimes. And I used to tell her about it whenever I did. But it's a first for her. To have someone outside of her bf and me.
It was just the way she called that she won't be able to talk tonight. I just recently gifted her a cologne that she said she is gonna wear. She told me she is gonna fuck in his car. She was being playful and even teased me by saying that she had to go get dressed & look pretty for tonight.
Now I know I have fucked other people too. But it just feels like being in an open relationship with your side chick whom you began to love you know…
She's soo hot tho that I can't help imagining her moans. It's been kinda long since we met. The way she sounds when she moans… I hate that dude..the colleague. He's gonna get lucky tonight
I don't know, we haven't talked since then. We may call tonight. Let me know if you want updates.