I come for you是什么意思

看语境和语调了。有“我是为你而来”的意思，也可理解为“我来找你，我来接你”

I come for you. 按朗文字典的解释可以解释为“我来接你”或者“我来抓你”⊙﹏⊙

柯林斯词典对 come for的解释。
If people such as soldiers or police come for you, they come to find you, usually in order to harm you or take you away, for example to prison.
#Lotte was getting ready to fight if they came for her.
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朗文词典的解释
1.to arrive to collect someone or something
#I'll come for you at about eight o'clock.

2.to arrive at a place in order to take someone away by force
#Members of the secret police came for him in the middle of the night.

我为你而来
come for 向…冲去
I saw the big dog coming for me.
我看见那只大狗正向我扑来。
来取; 来找; 来接
His cousin just came for him.
他表哥刚才来找他。

我为你而来!

我专程为你来的

我是来找你的