Yesterday I was washing and cleaning the car, and then I found an earring under the seat

Yesterday, while I was cleaning the car, I found an earring under the seat. It shocked me so much that I felt sick to my stomach and even threw up right there.

I took the earring inside and confronted my husband with it, asking him angrily: “What is this!?” He responded calmly, saying: “You’re not foolish, you know what it is”.

I explained that I found it in our car, and he suddenly got defensive, claiming he must have dropped it while giving a colleague a ride. He swore it wasn’t what I suspected.

The next day, I went to his workplace and questioned his colleagues to find out who the earring belonged to. When I reached the blonde woman he often has coffee with (who insists she’s just a colleague), I asked if it was hers. She swore it wasn’t hers, reassured me that my husband loves me and would never cheat.

I’m confused and torn. I don’t know what to believe anymore. I’m considering taking the kids and going to my mom’s place.