New relationship Same mistress

Here's the background 
I dated a total jerk for a year. His name is Cameron.  He cheated on me with this girl he works with. Her name is Tiffany. Tiffany has had a boyfriend for three years. And she knew I was Cameron's girlfriend. 
So Cameron and Tiffany got together. 
I ended things. 
A few months later I met this awesome guy mike. He's great. But he happens to work with Tiffany and Cameron. I had no idea. 
Anyway, now mike told me he had had a crush on Tiffany but it's all over now and they are just friends. 
I really do not want to be back in a situation with a cheater doing stuff behind my back. 
And alarms in my head went off when mike told me he had a crush on her. 
Should I go?

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