Just under a month ago, I got a new girlfriend, and let me tell you that if she isn't the most gorgeous girl I've ever met, then I don't know who is. We're quickly growing close together, and I'm happier than ever. However there is a problem involving my ex (of course). She's got a boyfriend too, and I didn't mind that, however she's beginning to...I don't know exactly how to put this...act up I guess would be the term. I could tell she wasn't happy to see my girlfriend and I together for her first time, and I can tell that she thinks my girlfriend is much prettier than her. I keep trying to get my ex and her boyfriend to go on a double date with me and my girlfriend; the boyfriend is all in about that, but my ex refuses to even be near my girlfriend. Obviously she's jealous, even if she's in a relationship too, and Im not enjoying it because she's kinda taking it out on me too. What can I do about this?

My ex is like a second sister to me and we've known each other since gradeschool. I'll try talking to her even less now that this is happening, but I'm afraid that she'll start taking even more of her jealousy on my afterwards. Oh well, I guess she's just gotta deal with it.