Husband not standing up for me

So my SO left his Facebook open and I started reading his messages. The first message was from his buddy. Him and his buddy were basically bashing me. He told my SO that he was surprised that he was still with me after 15 years. My SO said yeah I'm a sucker for punishment. Wtf 😠

Then the other message was to a chick that he use to work with. He told her he was going to be in town Thursday and wanted to meet up.

What should I do. Am I going over board?