guilty

My husband and I have been married for 25 years and we have 3 kids in college. He has had a mistress for about 2 years and does not think I know. I feel our marriage is strong enough that he will stop seeing her.
I recently went back to work about a year ago. A couple of weeks ago me and some people I work with went out for drinks after work. A couple of my bosses were there. We were all drinking but not drunk. To make a long story short I ended up leaving with my 2 bosses. I also ended up having sex with the both of them that night. It was great and I figured if my husband can do it so can I.
My 2 bosses and myself want to get together again but I am srarting to feel a little guilty and am afraid my husband will find out.

What should I do?

Do you think it's normal?

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