No need to punch urself hunny. If he knows ur insecurities are about for whatever reason, he should be loving enough to reassure u on a regular basis.
As much as it was sweet, ur rship stuff shouldn't be written on fb no matter how direct/indirect.
Just express to him how u feel n ask him not to post stuff like that on fb as u don't want anyone in ur personal life or using you both as table convosation.
Men don't think like us females lol we are more emotional. They know this but fail to understand it.
Leave it for a day, dont mention it n then when he is calmer then talk to him.