Jealousy, this stupid feeling when "negative thoughts and feelings of insecurity, fear and anxiety over an anticipated loss of something that the person values". We all had some moment in our life's when this feeling reaches its higher levels and it makes you do some crazy stuff (I was going to use other word but a friend of mine told me not to use bad words).
"According to a study done by the University of Texas at Austin, a specific set of brain circuits guides our emotional reactions to threats in the context of sexual relationships. This emotional-cognitive module, they argue, makes man innately predisposed to jealousy over a mate's sexual infidelity. It makes women innately predisposed to jealousy over a mate's emotional infidelity." So guys and girls have some different triggers, or at least they seem to respond to different motives, but it's just theoretical talk. For me the sexual and emotional part can exist in both gender.
So this emotion is neither subtle nor kind, but it's kinda complex.It throws the mind into turmoil and is difficult to dislodge. It's hard to keep your mind sharp and to be the most happy person all the time, because this emotion it will be in you brain all the time. Probably will get you crazy, and probably you will treat other people like crap because you are frustrated, and probably you will do something against the guy/girl that are "threaten" you and the person you like. But you can give this emotion a road of success and transforming it in a positive thing because if you have jealous, it means you like the person and if you change this negative jealous and the other people notice that you will improve yourself.
I'm a jealous guy, but I'm in that moment that I don't give a f&%$, at least most of the times. This feeling is kinda useless. When you are in a relationship, and you have jealousy of all the guys or girls that give some extra attention to the person who is with you, well you are dumb, because you must trust the person. That's one of the most important thing in a relationship. If the other person do something wrong....well....he/she is not the right person to you and deserves to have an STD. But continuing to my opinion, having romantic jealousy is tough to handle, and it hard to not giving in to bad thoughts but you need to be strong and well try always to be a gentleman. Because bit&%$ love gentlemen's.