Why would my cousin ignore me now?

So My cousin's wife was having a 'work spouse'... while interning in her office I notice and felt like she would eventually cheat on my cousin. I did not say anything because I did not want to poke my nose in her personal life.

Then one day 5 years later, one of her colleague informed me that she and my cousin were getting divorced. It reminded me of the thought that I had previously, she was cheating because her work spouse and her are still working together.

I met my cousin and felt sad when I looked at him as he looked different physically... so I told him what I was suspecting. He said that his wife invited her 'work spouse' home for their son's birthday. Then I told him to divorce, he refute so I suggested to look into it from this point of view.

I think he confronted his wife and my suspicion came out to be true. Since then I asked him a favor for my boyfriend... He volunteered to help. However, he started avoiding me... like why? Did I intrude in his privacy?

Why would my cousin ignore me now?
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