I think jealousy is a good thing. It means I have feelings for someone. The point to me is not to feel it less, but to feel it more.
Feeling jealous is different from acting controlling, IMO. There are many things you can do with the feeling, I feel. I could use it to communicate more plentifully with my partner, for instance.
The important thing to me is to understand the difference between feeling and action. And, to realize that I am alone responsible for my feelings. Whatever I feel, I can always do whatever I want. Feelings can only help me.
I don`t think feelings will give me leprosy or anything; I think I can go right ahead and keep on feeling them. I hope.