可以用 "he is too selfish" 来表达 "因为他太自私"。

"Selfish" 指的是关注自己的利益而忽略他人的利益，是一种贬义词。它来自英语单词 "self"，意思是 "自己"，加上后缀 "-ish"，表示 "像……一样"。

例句：

He only thinks about himself and doesn't care about others. He's too selfish. (他只考虑自己，不关心别人。他太自私了。)
She's always looking out for number one. She's so selfish. (她总是只顾自己。她真自私。)
He's always taking credit for other people's work. He's such a selfish person. (他总是把别人的工作归功于自己。他是个太自私的人。)