What should you do if you like your older brother's friend?

I wouldn't even mess with that. What if he and your brother are really good friends and then you go out with that friend and the friend treats you bad, or you guys break up then that would mess up the relationship your brother had and they would fight.

There are plenty of fish in the sea. Go out and look for another.

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I think you should talk to your brother about it. And then if it's ok with him then you should go for it, as you have nothing to loose. However, if your brother isn't ok with it then it's not the end of the world, he can't decide who you date or not. But seeing as this is his mate, if he is not happy with it then he could make the situation very awkward. And he could tell his friend things about you to put him off.

Stomach it for the time being and observe. NOT in the freaky stalker kind of way, but when hes over just see how he reacts to you being there. _______________________________________________________________________

I think there's nothing wrong with that. If you like your brother's friend then the first person who should know that is your brother then base your decisions in his reaction regarding what you told him. If positive then maybe he can even help you be more close to his friend. If negative, well that's the hard one but then all I can say is that weigh everything up then decide what's best to do.

It depends. If you're a few years apart/not apart in age, then you might want to consider telling him, but you have to know him well first, and consider the fact that he might tell someone else and you'll only end up getting hurt or humiliated. However, if he is really nice and you know him well enough, go ahead and tell him, you don't have too much too lose if you feel you can really trust him. If you are telling him, make sure your brother isn't around/involved when you tell his friend; it will only make it harder and more awkward for you. And, if his friend isn't all that nice, and you feel you can't trust him much, then move on and find someone else to like, he may not be worth the effort. Either way, it's fully up to you and how you feel. Just consider what might happen if you do tell him and if he can't be trusted.