> すぐ傍から告げられた言葉に、胸の鼓動がどんどん高鳴りを増していく。

As usual, I have problems understanding ～てくる/いく. I've already studied their
meanings, but whenever I encounter them, I don't know which one it is.

He hugs her, and says something romantic, and she thinks that. To me, it means
the throbbing is growing more and more, but I'm wondering if I'm wrong and it
means the throbbing is growing towards him, in his direction.
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2022-08-09T03:29:59.050
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2022-08-09T03:29:59.050
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question
meaning nuances
What does ～ていく mean here?