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This is from a Manga, and I don't quite understand how the soredake in the 2nd
bubble fits into it? But maybe I am completely off with the meaning of the
sentences as a whole - so I've put what I think they mean in italics as well.

Bubble 1:

俺はどっちかって

いうと

そういうのは

鈍い方だけど

_I'd say I am a reserved (quiet/solemn) person, but_

Bubble 2:

それだけ 俺も

航を見てたって

ことだ

_I also watched Kou_

Does the soredake simply add an "only"? i.e. I also only watched Kou.

Any pointers are much appreciated. Thank you!
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2016-12-30T08:11:26.123
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2016-12-30T09:34:46.947
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question
grammar translation
それだけ　in this sentence?
> 「それだけ + Phrase or Mini-Sentence + って/という + こと（だ/です）」

would need to be remembered as a set phrase because it is a very common one. I
means:

> "That is/proves (just) how much ~~~~."

Thus, the sentence in question means:

" ** _That is (just) how closely I was watching Kou._** "

Though there is not enough context provided, I would highly doubt that
「鈍{にぶ}い」 means "reserved, quiet, or solemn" here as you stated. I would think
it is more like "slow" or "dull-witted".

Finally, regarding your translation of 「も」....

I will not go into details as it is not part of your question, but you will
need to learn not to use " ** _too_** " or " ** _also_** " in your translation
every time you see 「も」 because that is not what it always means. 「も」 is an
extremely nuanced particle.
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2016-12-30T08:46:27.070
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2016-12-30T08:55:05.643
2016-12-30T08:55:05.643
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answer
Bubble 1: The speeker confessed that he (or she) is not so sensitive to
something (I guess other's emotion).

(I'm not sure what is the main subject in the cartoon, but I gess this even
insencitive person might has noticed something that is the main subject
related "航(a boy?)". This cartoon is a love story?)

Then,

Bubble 2: I guess, the meaning "それだけ" is the following,

Even insencitive person like me have noticed the internal something of "航,"
because I watched him (or her) more carfully than usual.

（何かに気が付くだけ（それだけ）、俺も航を見ていた）
CC BY-SA 3.0
2016-12-30T09:34:46.947
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2016-12-30T09:34:46.947
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answer