What should i do, i need help???

Let him know what your concerns are. But realize he is gonna do what he wants to do, regardless of what you tell him.

tell him, " hey dont we have plans tomorrow?" because if he planned that with you before his little fight in the school yard, then it is very rude for him to change up on you. if he goes anyway then it is disrespectful. as for him fighting and you not liking it, well sometimes we dont like what other people do, but we dont have a right to tell them not to. you can tell him you dont like it, but you cant tell him to stop, that is his call. if you are ok with that is your call. if you dont want to watch then i would certainly not go, i am sure you can find something better to do than feed his ego and be uncomfortable at the same time.

someone said it "He is a man, men are silly and simple". Yeah, we like to fight, it's kinda fun 4 us, It's natural isn't it? It may not be right, but...testerone? In the locker room we throw a few punches around, but were all friends and would seriously hurt one another. But if he is going to fight a "non-friend" make sure he doesn't do it.

Tell him the truth,what you think,try to make him stop or maybe hes trying to play a joke since their friend they dont want to realy hurt each other, if that doesnt work beg him[tell this at his house].

Why are they boxing in the first place? As a sport or because of jealousy? Just stay out of it. You don't have to go to see either.

Its a guy thing. He's going to box this other guy regardless of what you say to him. If you don't let him, he may end up resenting your comments and emasculating him. I say if it is a friendly boxing match, and just for fun, let him do it. There is no harm in guys doing this sort of thing for fun or to blow off steam. I'm sure he has his reasons for wanting to box so let him.

I think you should tell him you don't support violence and would be happy to come over, should he decide not to fight. Tell him you think fighting is juvenile and you're not impressed. He's probably trying to show off to you on some level, so teach him how to show off the right way - by being a bigger man.

You can't stop them. Don't go to see it. If it is a legitimate boxing ring with a referee, fine. If it is not, give the police a heads up about it.

Tell him your concern and you love him a lot that you don't want to see him get hurt. If they are gonna fight, tell them use pillows. If that doesn't work, get in between the fight and say "THATS ENOUGH I DONT WANT TO SEE MY BOYFRIEND AND HIS FRIEND FIGHTING! NOW STOP OR ELSE IM GONNA PUNCH YOU BOTH OUT COLD"

Tell him how you feel. If he does end up boxing him, tell him that you don't want to watch. Tell him that if he got hurt, there would be no reason to live anymore.

Are they fighting due to an arguement or a sport? If due to an arguement, it is childish and reckless to do such acts especially at school. You should let him know how you are really feeling and let him make his own "educated" decision.