Give them their space
Once you’ve accepted that this girl is an important part of your friend’s life, take a step back and let them enjoy their relationship. Don’t hover around the couple all the time, just so you can get to spend a few valuable moments with her. By spending too much time together, you may frustrate yourself enough to inadvertently express your jealously. And you should know that such outbursts will benefit nobody. In fact, it could make matters awkward between you and your friends girlfriend, but more importantly, between you and your bestfriend. Until you’ve dealt with the matter, make sure you let them know that you’re giving them time to enjoy their relationship. But don’t fall off the radar either.

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Accept it
There really isn’t much you can do about your best friend dating the girl of your dreams. If your friendship with the guy matters to you more than this girl who is seemingly perfect for you (but is not with you), then you need to learn to just accept the situation. Besides, the girl may tick all the boxes in your imaginary list, but unless you really go out with her, you’re not going to know exactly how perfect she is for you. So what you are effectively simmering over is that your best pal is dating a girl who has a chance of being the ideal girl for you. Do you even hear yourself? Why would you mull over something you’re not entirely sure of?

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Be happy
If the friendship truly matters to you, you would know that at the end of the day, you have got to be happy for your friend. After all, he is in a relationship and he is happy about it. Your problem, in this case, should hardly be his problem! Be the better man, rise above your own feelings and learn to be genuinely happy for the both of them. Would you rather that your friend be saddled with a woman who is making his life miserable? Or that he date someone who doesn’t like his friends, including you? Deal with your emotions and learn to be happy.

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Don’t be devious
Hollywood, Bollywood and literature across languages are full of instances where a jealous guy or girl has plotted the breakup of a friend. No, you’re not in Fatal Attraction. So stop flattering yourself. No matter how tempted you are by the girl and by the possibility of causing their split, kindly refrain from filling either of their ears and turning them against each other. Consider the fact that even if they do breakup, you will have to live with your own guilt. Also, there’s no guarantee the girl will want to hookup with her ex’s bestfriend soon after the breakup. Don’t rule out the chance of their reconciliation. And if that happens, it can make you look quite silly. So before you go about playing Loki in their lives, think a million times.

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Avoid fantasizing
Your mind has a mind of its own. Fine. Not all of us can control where our minds go. If we could, we’d be far more at peace with ourselves and the world around us. Having said that, you really need to draw the line at fantasizing about your friend’s girlfriend. Of course you think he’s hit the jackpot and of course she’s one hell of a girl, but that’s about it. Acknowledge the fact and move on. The more you think of going all hanky-panky with your friend’s girl, the more you’re going to view her with the same eyes when she’s in your presence. The next thing you know you’re staring at her and your friend just caught you doing that! Stop while you’re still ahead.

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Find other distractions
There have seriously got to be at least a hundred different things you can do to keep yourself occupied and prevent your mind from messing with you. Chief among them is the option of finding yourself a girlfriend. Don’t find a girl just to get your mind off your bestfriend’s gal though. Look for a girl who keeps your interest alive and manages to hold your attention long enough to make you forget about your jealousy towards your friend. If finding a date is difficult, try involving in other activities that require you to focus a lot. Pick up a sport or take up hobby lessons. Just don’t sit at home and wonder how your life would’ve been different had she picked you.