Xūróngxīn tài qiáng huì ràng rén shīqù zhēnzhèng de péngyou.
Too much vanity will cause a person to lose true friends.
Tips
usage
虚荣心 is always negative — an inflated desire for social recognition or status. Compare with 自尊心 (zìzūnxīn, 'self-esteem'), which is generally considered healthy.