Not jealous
but here is why:
1. I trust her completely. She has never, ever given me a reason not to. That being said, if she wanted to fuck around...there is really little I could do to stop her.
2. A true friend of hers will always respect the her relationship with me and would not give me reason to be jealous of him. If and when he does, I will be the first to step up to him and let him know that there is a problem.
Unwarranted jealousy is very unattractive, imho. I don't want her telling me that I can't have girl friends so I wouldn't tell her that. Two of my best friends are very hot girls. **Do I have sexual thoughts about them.....ABSOLUTELY! I am just mature enough not to act on them and thus not give my girl a reason to be jealous.