Am I Being Shared

Back in two thousand and seventeen (I was eighteen) I went to a party and had sex with an older man.
It was a wild hour or so, where he fucked my mouth, pussy and arsehole, making me orgasm multiple times. And it's still the best sex I've experienced.

Five months ago I met my then new boyfriend's father, who just so happens to be the man who I had sex with that night.
Since then my boyfriend has proposed to me and I've said yes. Even so I couldn't stop thinking about and wanting to experience sex with my fiancés father again.
We'd recently begun sending each other horny messages, so I knew he wanted to fuck me again. And we'd swapped naked pictures too.
His cock is much larger than his sons and being honest, he's much much better in bed.

Last weekend my fiancé attended a football match and stayed over in London. While he was gone I spent the night at his father's place and had sex all over his flat.
Before picking his son up from the train station later the following morning, we had sex again and I carried his fathers cum up my arsehole when I picked up my fiancé.

This is where I need help.
On the journey back home, my fiancé said this "I hope you and dad had fun last night. He messaged me this morning to say you were amazing".
He didn't add anything to that in the car, but all week my fiancé has been extremely affectionate. And even mentioned he's working away soon, so I might like to stay at his fathers, or he could stay at ours.
When I asked why, he calmly said "Because we both know he Likes you".
I've not added anything, but now I'm thinking they're sharing me and not directly saying anything.