It's okay to be jealous, because jealousy is a natural human emotion. Just remember though: there's "cute jealous", and then there's Othello...
In all seriousness though, I do think your concerns are valid, but you are right when you say you can't tell her who she can and can't have as friends on FB. Most of us are friends with our exes on social media, but it doesn't mean we still pine for them. I think you should trust your girlfriend until she gives you a reason not to trust her. Keep the lines of communication open and clear between you two, and try to focus more of your energy on your relationship and the good things you have going on in your life. He's her ex for a reason, so even though your feelings are normal, I don't think it sounds like you have a reason to be worried about it at this point.
Last edited by melancholia; 22-03-16 at 06:46 AM.
"Caring is not an advantage."