A friend of mine, who has a good relationship with the opposite sex, says to my face every day that he thinks I'm ugly. What should I do? Can you kill him?

If your relationship is ok, then your friend must be joking. He called you ugly to your face. On the one hand, he may be teasing you and trying to get your attention. On the other hand, he may think he is a buddy, just saying it. Later, when you were more concerned, he liked to tease you with it. You can just walk down the slope, or just make a joke. If he talks too much and you don't respond, he will be annoyed. If he gets bored, he will stop talking. He's joking. You can't kill him. Even if he really scolds you, he won't die. You can also make fun of him. He says you are ugly, you can say I can't, I'm not as ugly as you, you are uglier than me, or you are better than me, and so on. Just joking. Don't care too much. You are all good friends. You can also make a joke. Try telling him about you.