Jealous when other guys look at my girlfriend!!

Ohh I hate this feeling that I have got at the moment... please some1 help me out...

i am so lucky to have a really beautiful girl by my side. I love her so much and she loves me so much. The trust is there, I have known her for years and we both fully trust each other!! which is wicked... (i have never had that before)

but if we are out together I will be paranoid about other guys looking at my girl... her body is so sexy it gets me angry to know other guys are perving over her... I no its natural but I hate to know that guys are looking at her body like a peace of meat... I find it really horrible inside and I think its jealousy!!!

why can't I be proud and when I see guys looking at my girl not get angry!!!

some help me understand this problem!!!
Jealous when other guys look at my girlfriend!!
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