我的 惟一英语怎么说

简单来说就是only love...

再复杂点的就是 you are my soul mate that i found for several centuries....

还要不要再复杂点?

you are made for me

前面几个都太中式,you are my one of a kind,惯用美语,标准意思是你对我是独一无二的,和你想表达的差不多

You are my only love.H或直接用My only love.