Is it normal to be sad when friends with benefits finds somebody else?

I had an on and off friends with benefits for two years and we were clear it was never going to be anything serious. Well about a month ago he ghosted me then came back a few days ago with a late night “wyd” text I ignored it and not even 3 days later he posts him on a date with a girl holding hands. I just removed him off social media after that to move on. A part of me still feels sad we had a lot of memories together even though I know I shouldn’t.. is this normal
Is it normal to be sad when friends with benefits finds somebody else?
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