喜新厌旧的英文：
[Literal Meaning]
like/new/loathe/old
to like the new and loathe the old

[解释]
厌：厌恶。喜欢新的，厌弃旧的。多指感情不专一。

[Explanation]
to abandon the old for the new

[例子]
喜新厌旧是人的天性之一。

[Example]
Liking the new and hating the old is one of human natures.

[英文等价词]
to like the new, and hate the old
enamored with new people (e.g. new girlfriend), bored with the old

Don't be a man who dislikes the old and takes a delight in the new.
做人不要喜新厌旧。