Sexual experience with play partner keeps running through my head

We soft swapped with a couple… parallel play followed by oral & I can’t stop thinking about how he ate my pussy. I’m usually so let down by the experience when we swap bc my sexual connection with my bf is so good that honestly everything else feels disappointing but this new play partner was so hot and talented. I keep fantasizing about it and I feel guilty! Doubt we will play together again or if we do, not anytime soon.

Is this normal? Would I hide this from my partner or if I should talk to him about it… how?