My husband's associate covered up for him while he cheated on me?

My husband, 40, has been cheating on me with a 24 years old that was someone I also knew very well and was dear to me. He has his own business, and together with an associate they deal with real estate and make a lot of money.

I found out that he has been sleeping with this 24 years old for at least 3 months now, having sex with her in one of those old motels they recently bought to renovate it. I considered his associate my friend too. He had lunch with us, visited for holidays. I feel double betrayal.

My husband's associate covered up for him while he cheated on me?
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