My friend got mad at me because I won't treat him out.  

Your friend is at fault here. He should understand your not wanting to spend your money on him. If you did not invite him out to eat screw him. Don't let it bother you at all. Friends don't treat each other like this.

Your friend is at fault, because he has money, to buy things for him self, and your other friend who you were treating out, I think that was so sweet of you to do that for him, your other friend want you, to spend your money on him, so he can keep him money that is not right, I am glad you help out your friend, who didn't have any money, and your other friend, tell him to stop being so greedy.

Thats very childish of your friend if he is really your friend he will understand you for that matter.

i think your friend is narrow minded. he should realize why you treated your other friend and that he shouldn't be acting immature like that.

Your friend just felt jealous. But he's being unreasonable and shallow. You should talk to him nicely. I know he understands the situation but jealousy is making him nuts! Lol. Talk to him and explain everything. Maybe you can apologize too for making him feel bad, but if you do, tell him that he's acting a little silly about the whole idea. He should apologize too for acting like that.