how to mke my friend happy

Unfortunatley there isn't much you can do for him. He needs to just process his feelings an dtime will heal all wounds. When I went through a breakup and felt the same as him, I was comforted in knowing that I could count on my friends and that they loved me and olny wanted me to be happy but when I was pushed into doing things when I really didn't want to, it helped for a little while but I still felt miserable. You can just ask him if there is anything he needs from you, let him know you are there, and listen if he wants to talk. Other than that let him be an dhe will come around.

You have to give him time to deal with the breakup and to heal from the broken relationship. If he wants time alone, make space for him to be alone. Meanwhile, do let him know that if he is ready to talk or if he needs someone to listen to him, you are there for him. You do not have to make him happy at this point, it is good enough to let him know that you are beside him when he is going through this tough time.