I recently opened up a new Facebook (got rid of the old one) and added my ex-girlfriend (high school sweetheart) and a few years have passed since I have seen her. In her message to me she states that she had been wondering about me for the longest time, that she missed me and I was always a great person to her and that her family still asks about me. Just wanted to know what that means. Is it just a friendly greeting or something more?

Sounds like it means she has wondered what happened with you and that her family remembers you. Sounds like what old friends say that want to just catch up with what has happened in life.

Is she married? Are you? It could mean anything, depending on your circumstances.

Ask her.

It could mean anything, talk to her and see what's up, but don't assume, or presume anything.