dk what to do 😫

my bf and i finally ended up having sex tonight after not getting any for some time and it wasn’t all that great. he’s pretty confident with his sex game & thinks it’s the best whereas i don’t really agree anymore. i don’t want him to feel less of a man if i tell him he’s not satisfying me the way he used to and i don’t want to keep giving the impression that it’s good when it isn’t.. any suggestions on what to do?