The analyses of a text #1

The narrator recalls his adolescence.
His grand aunt and her distant relative Mr. Dick came to London after her going bankrupt, and so he works as the secretary for Doctor Strong in his spare time, who was the head master of the school the protagonist went to.
One day, His best friend Agnes and her father, a local lawyer, Mr. Wickfield visited Doctor Strong.
And the next day, Mr. Wickfield's partner Uriah, who was once the clerk for him, came too.
One night, the narrator finds Doctor Strong, Mr. Wikckfield, and Uriah is together in a room.
Mr. Wickfield and Uriah have had a strong suspicion that Dr. Strong's young attractive wife has a love affair with her cousin Mr. Maldon, and Uriah insinuated it to the narrator a few days ago.

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'I regarded myself as a refuge, for her, from the dangers and vicissitudes of life. I persuaded myself that, unequal though we were in years, she would live tranquilly and contentedly with me. I did not shut out of my consideration the time when I should leave her free, and still young and still beautiful, but with her judgement more matured - no, gentlemen - upon my truth!'
His homely figure seemed to be lightened up by his fidelity and generosity. Every word he uttered had a force that no other grace could have imparted to it.
'My life with this lady has been very happy. Until tonight, I have had uninterrupted occasion to bless the day on which I did her great injustice.'
His voice, more and more faltering in the utterance of these words, stopped for a few moments; then he went on:
'Once awakened from my dream - I have been a poor dreamer, in one way or other, all my life - I see how natural it is that she should have some regretful feeling towards her old companion and her equal. That she does regard him with some innocent regret, with some blameless thoughts of what might have been, but for me, is, I fear, too true. Much that I have seen, but not noted, has come back upon me with new meaning, during this last trying hour. But, beyond this, gentlemen, the dear lady's name never must be coupled with a word, a breath, of doubt.'
[David Copperfield by Charles Dickens]
1. I think the adjectival phrase in blue modifies "her."
So I was wondering why there is "and" before "still young."
2. I'd like to know why "no, gentlemen"is inserted into middle of a sentence.
3. I'd like to know if "occasion" means "celebrations of wedding anniversaries."
4. And I'd like to know what "her equal" means.
Thank you in advance for your help.