How can I not be jealous?

Ahh, girl. I am in like the same situation. Truthfully, I hate to say it but I really don't think there is a way to not be jealous. I have just talked to him about it and he saw it hurt me and he stopped being so flirty. Other than that, I just act like I'm not jealous, because I feel like just showing it really doesn't make the situation any better. Plus, being jealous is a good sign, it shows that you really care for him!