Greetings HelenaTroy
I have always seen jealousy as insecurity within a relationship; something that should be addressed immediately. Jealousy by itself is a very damaging emotion; it can often make a person do and say things that they would normally never think of. Because it stems from insecurity, it doubles the emotional roller coaster that a person finds themselves on.
Communication, constant and consistent, open and honest; I have found that often this will dispel feelings of jealousy. Not always, but often.
I make it a point in my relationships, whether they be intimate or just friends, to always be open and honest. If I feel that I need more time with someone, I say so. It is then up to me to decide if I can accept what the other person is willing to offer. If I can not, the relationship ends; if I can, I work through the feelings that are behind the insecurity.
I hope this day finds you in good humor and good health
jaxon