Dear Lizzie … I have been dating a man for about six months. I met him through a mutual friend. I am new to the area and only have a few close friends. Here is the problem: He had a long relationship for about two years before I came into the picture. The relationship ended over a year ago and there are still problems between them. I didn't think there would be a problem because my boyfriend lives in New Jersey and isn't around for many functions. He's moving back to the area and I am concerned about his ex's jealousy. Over the holidays we had a few get-togethers and his ex was very jealous …