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I made an attempt to decipher what's behind the black bars. Some of Chris' words show up through the paper because he writes quite firmly and the photo taker put the letter under a strong light source, so you can see some of his words through the page if you flip it over. Cyan is the letters I could make up, and orange is the letters I guessed based on the cyan letters (in hindsight, my choice of colours is terrible. Sorry!). The most notable thing here is a mention of a wedding in line 4. Most likely the censored text is personal information the author was comfortable enough to confide in Chris with; why he didn't choose to put the personal info in a separate letter that he won't have to show to the Internet escapes me.
When the density of black letters is low, Chris' handwriting isn't tough to make out. He does not curve his "y" so it's easy to distinguish "y" from "g". His "t" is weird: the horizontal stroke is sometimes not in the centre of the vertical stroke; I think there's a similar pattern in the all caps portion of the letter so I believe this happens when he's emotionally agitated. He also keeps the serifs on the "I" so there's no way of confusing it with "l". But that's all I can make out of the letter.
Edit: Just realised there's a second part of the letter that's blacked out. As the good Lord said, "I'M WORKING ON IT!"