Relationship help - uninvited from a wedding, my girlfriend/fiance is still going-pressure on relationship?

Your first facebook comment was harmless. .However when the bride and her friend started on their high and mighty 'don't owe you any explanations' parade, you should have handled it better (eg. Not blasting them on fb or private messages). Being uninvited to The wedding is harsh, but your fiancee is in a really difficult position, being caught in the middle of a situation that You mishandled. It's not like she is choosing them over you, she's in The wedding party. Just keep in mind your fiancee had nothing to do with you being uninvited - you did that yourself. It's probably already bad enough for her that You aren't invited. She could talk to The bride about it but don't expect too much, and don't be mad at her for going. It was an overreaction on everyone's part.