こんな ことしたら心動くんだ. Is this sentence correct?


Recently I watched a show and the girl did something for the guy and he was
moved by the girl's action. I may have heard it wrongly but I thought I heard
the guy said it as: こんな ことしたら心動くんだ to another friend. I did a Google translate
and it turned out as "I'm moved when _**I**_ do this"

Why is it "I" and not "he/she/someone else"?

Then I did a test by changing the the sentence to make it into a probable
"when/if", but Google failed to translate the below sentences.  
こんな ことされたら心動くんだ. If you do something like this こんな ことしてくれたら心動くんだ. If you do
something like this こんな ことしてくれば心動くんだ. If you do something like this

I was puzzled as to why the translated answer to all the three above altered
sentences was the same, that is "If you do something like this". Are they
grammatically missing something? Kindly advice and correct the sentences if
they are wrong. Thank you.

