He helped me to understand where was the fundamental error in my code

Some minor remarks on the provided code. The problem is that currently self-test doesn't pass. The problem that encryption/decryption of the first block goes fine but next ones are not. I also require you to preserve style and formatting of the code. You also must add short comment in all place where you have made fixes.
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Francisca:
Are most single women lesbians? Why are there always so many single dudes?
(30 November 2016)

Francisca:
I've never ever seen an attractive woman that was single before, all the attractive women are either taken or seeing thousands of guys.
(30 November 2016)

Francisca:
And the single women at these social events and dating sites are usually fat.
(30 November 2016)

Francisca:
Every bar, clubs, dating sites, you name it, there are always far more single men than women.
(30 November 2016)

Marry:
What would happen if I do this with a new relationship?
(30 November 2016)

Marry:
During the next time we're on a date, I tell her that I really wouldn't be a good boyfriend for any girl, and I mention a number of things about myself that make me unattractive and undesirable.
(30 November 2016)

Marry:
Let's say that I've taken a girl out on a few dates, then she agreed to be my girlfriend.
(30 November 2016)

Melva:
How to live with someone disrespectful?
(30 November 2016)

Melva:
Her baby is my 2 year old godson.
(30 November 2016)

Melva:
I can't kick them out with no where to go.
(30 November 2016)