Hi,

They're all linking words that show a contrast, but other than that, they're quite similar. As you noted correctly, what is different are the words following the linking words. Let me make a few corrections to your examples:

Your sentence: in spite of cheatting on me , I have cut you some slack

My correction: In spite of cheating on me, ...

Explanation: One-syllable verbs that end with consonant - vowel - consonant, like 'run' and 'stop,' get a double final consonant, so 'run' becomes 'running' and 'stop' becomes 'stopping'. 'Cheat,' however, ends with vowel-vowel-consonant, so you don't double the consonant when you say 'cheating'.

"Despite his betrayal...," is correct.

"Even though he cheated on me...," is correct.

"No matter how betrayed he did...," should be, "No matter how much he betrayed me...," or "No matter how betrayed I felt..."

"Regardless whether he treat her with bad attitude or not...," should be 'Regardless of whether he treated her well or poorly...,' or, "Regardless of his attitude..."

I hope my feedback was helpful!