你要幸福、要快乐、要留住我们的爱。（英文怎么说？）

BE happiness ,And keep our love

PS 这里HAPPINESS 有幸福快乐的双重意思，言简意赅。能充分表明你深深的祝福

You must be fortunate, happy and keep our love.

You want to be happy
have to be happy
want to keep our loves

you need to be happy and keep our love with you.

You must be happy and cheerful and remain our love.