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Don't overreact
It's ok to feel jealous, as long as you can contain and channel it in a positive manner. Keep in mind that having other guys flirt with your girlfriend is normal -- just consider it as flattery on both your parts. As long as she looks but doesn't touch, what's the big deal?

Deal with reality
Focus on what is really happening, not what you perceive to be happening because with time, you may end up having difficulty distinguishing fact from fiction, and you don't want to kill an otherwise perfect relationship over things that never really happened. Don't let your imagination dictate the kind of person she really is.

Respect yourself
Realize that she chose you for a reason and there is no need for her to be so easily tempted elsewhere. Remind yourself that you're every bit as deserving as those guys you feel threatened by.

Next in overcoming jealousy comes your evaluation of the relationship. If you've made it this far, there has to be a reason for it. Focus on these positive points before moving on to any negative ones. Chances are that the good points outweigh the bad ones, otherwise one of you would have thrown in the towel by now. By comparing the real relationship to your internal feelings of jealousy, you should gain balance and realize competitors will have a hard time taking her away from you.

Inflate your ego
Because this feeling is internal, the biggest step in overcoming jealousy is to work on yourself. Feeling jealous about her relationship with another guy has much more to do with you than it does with him. To overcome this, you have to boost your self-esteem.

Take time to remind yourself how great you are. The very fact that she's with you means you have beaten all the other men in the world. Any rivals can't just waltz in and take her away because you're already miles ahead of the game. Channel time and effort into the relationship to make her happy, and when she tells you “You're the best,” it'll do wonders for your ego.

Overcoming jealousy involves not just concentrating on the relationship, but also increasing your self-opinion in all other areas. Take pride in the things you're good at, take more time with the hobbies and interests you enjoy and excel at, and surround yourself with people who think you're just swell. Get a haircut, buy a sharp new suit... do whatever you can to remind yourself that you're the bomb, and you won't worry about all the other guys in the world.

Trace all future episodes of jealousy
Keep track of all your future feelings of jealousy. If you find yourself suspicious or angry about another guy, sit down and analyze it. Get a clear idea as to why you feel threatened, listing all the reasons on your side and his. Then try to rationalize why these feelings are justified. Attempt to imagine the world in which all the crazy thoughts are true, and you'll find that all the pieces just won't add up. Eventually, you'll come to dismiss your jealous thoughts as quickly as they crop up.