How do I stop being so angry that my friend backstabbed me?

If this guy was a TRUE friend, he wouldnt have done what he did to you, then laugh about it! You have the right to feel how you want. You have nothing to feel guitly about.

Do you and your friend often compete against each other, or is this the first time? If it’s not the first time, maybe that’s the underlying issue you need to address. A little healthy competition is great, but maybe you both need to set some ground rules for yourselves — for example, that you’ll back off if the other one has a crush, and not go for the same girl. (Remember there are plenty of crushable girls out there!) Hopefully you and your friend can come to some agreement that maintains your friendship, while supporting each other in pursuing romantic relationships, too.

Move on with your life, and be happy. True friends dont step on each others toes. Find another girl , their are so many of them. Also, never hold a grudge. Its not healthy.

its normal to feel that way, at least for a while. dont hold anything like a grudge against him and even if u do dont let it show. if u feel happy for him, then be happy. dont force urself to feel angry just because u think u should.